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TOMOYO Linux Cross Reference
Linux/lib/test_overflow.c

Version: ~ [ linux-5.10-rc1 ] ~ [ linux-5.9.1 ] ~ [ linux-5.8.16 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.72 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.152 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.202 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.240 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.240 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.85 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0 OR MIT
  2 /*
  3  * Test cases for arithmetic overflow checks.
  4  */
  5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  6 
  7 #include <linux/device.h>
  8 #include <linux/init.h>
  9 #include <linux/kernel.h>
 10 #include <linux/mm.h>
 11 #include <linux/module.h>
 12 #include <linux/overflow.h>
 13 #include <linux/slab.h>
 14 #include <linux/types.h>
 15 #include <linux/vmalloc.h>
 16 
 17 #define DEFINE_TEST_ARRAY(t)                    \
 18         static const struct test_ ## t {        \
 19                 t a, b;                         \
 20                 t sum, diff, prod;              \
 21                 bool s_of, d_of, p_of;          \
 22         } t ## _tests[] __initconst
 23 
 24 DEFINE_TEST_ARRAY(u8) = {
 25         {0, 0, 0, 0, 0, false, false, false},
 26         {1, 1, 2, 0, 1, false, false, false},
 27         {0, 1, 1, U8_MAX, 0, false, true, false},
 28         {1, 0, 1, 1, 0, false, false, false},
 29         {0, U8_MAX, U8_MAX, 1, 0, false, true, false},
 30         {U8_MAX, 0, U8_MAX, U8_MAX, 0, false, false, false},
 31         {1, U8_MAX, 0, 2, U8_MAX, true, true, false},
 32         {U8_MAX, 1, 0, U8_MAX-1, U8_MAX, true, false, false},
 33         {U8_MAX, U8_MAX, U8_MAX-1, 0, 1, true, false, true},
 34 
 35         {U8_MAX, U8_MAX-1, U8_MAX-2, 1, 2, true, false, true},
 36         {U8_MAX-1, U8_MAX, U8_MAX-2, U8_MAX, 2, true, true, true},
 37 
 38         {1U << 3, 1U << 3, 1U << 4, 0, 1U << 6, false, false, false},
 39         {1U << 4, 1U << 4, 1U << 5, 0, 0, false, false, true},
 40         {1U << 4, 1U << 3, 3*(1U << 3), 1U << 3, 1U << 7, false, false, false},
 41         {1U << 7, 1U << 7, 0, 0, 0, true, false, true},
 42 
 43         {48, 32, 80, 16, 0, false, false, true},
 44         {128, 128, 0, 0, 0, true, false, true},
 45         {123, 234, 101, 145, 110, true, true, true},
 46 };
 47 DEFINE_TEST_ARRAY(u16) = {
 48         {0, 0, 0, 0, 0, false, false, false},
 49         {1, 1, 2, 0, 1, false, false, false},
 50         {0, 1, 1, U16_MAX, 0, false, true, false},
 51         {1, 0, 1, 1, 0, false, false, false},
 52         {0, U16_MAX, U16_MAX, 1, 0, false, true, false},
 53         {U16_MAX, 0, U16_MAX, U16_MAX, 0, false, false, false},
 54         {1, U16_MAX, 0, 2, U16_MAX, true, true, false},
 55         {U16_MAX, 1, 0, U16_MAX-1, U16_MAX, true, false, false},
 56         {U16_MAX, U16_MAX, U16_MAX-1, 0, 1, true, false, true},
 57 
 58         {U16_MAX, U16_MAX-1, U16_MAX-2, 1, 2, true, false, true},
 59         {U16_MAX-1, U16_MAX, U16_MAX-2, U16_MAX, 2, true, true, true},
 60 
 61         {1U << 7, 1U << 7, 1U << 8, 0, 1U << 14, false, false, false},
 62         {1U << 8, 1U << 8, 1U << 9, 0, 0, false, false, true},
 63         {1U << 8, 1U << 7, 3*(1U << 7), 1U << 7, 1U << 15, false, false, false},
 64         {1U << 15, 1U << 15, 0, 0, 0, true, false, true},
 65 
 66         {123, 234, 357, 65425, 28782, false, true, false},
 67         {1234, 2345, 3579, 64425, 10146, false, true, true},
 68 };
 69 DEFINE_TEST_ARRAY(u32) = {
 70         {0, 0, 0, 0, 0, false, false, false},
 71         {1, 1, 2, 0, 1, false, false, false},
 72         {0, 1, 1, U32_MAX, 0, false, true, false},
 73         {1, 0, 1, 1, 0, false, false, false},
 74         {0, U32_MAX, U32_MAX, 1, 0, false, true, false},
 75         {U32_MAX, 0, U32_MAX, U32_MAX, 0, false, false, false},
 76         {1, U32_MAX, 0, 2, U32_MAX, true, true, false},
 77         {U32_MAX, 1, 0, U32_MAX-1, U32_MAX, true, false, false},
 78         {U32_MAX, U32_MAX, U32_MAX-1, 0, 1, true, false, true},
 79 
 80         {U32_MAX, U32_MAX-1, U32_MAX-2, 1, 2, true, false, true},
 81         {U32_MAX-1, U32_MAX, U32_MAX-2, U32_MAX, 2, true, true, true},
 82 
 83         {1U << 15, 1U << 15, 1U << 16, 0, 1U << 30, false, false, false},
 84         {1U << 16, 1U << 16, 1U << 17, 0, 0, false, false, true},
 85         {1U << 16, 1U << 15, 3*(1U << 15), 1U << 15, 1U << 31, false, false, false},
 86         {1U << 31, 1U << 31, 0, 0, 0, true, false, true},
 87 
 88         {-2U, 1U, -1U, -3U, -2U, false, false, false},
 89         {-4U, 5U, 1U, -9U, -20U, true, false, true},
 90 };
 91 
 92 DEFINE_TEST_ARRAY(u64) = {
 93         {0, 0, 0, 0, 0, false, false, false},
 94         {1, 1, 2, 0, 1, false, false, false},
 95         {0, 1, 1, U64_MAX, 0, false, true, false},
 96         {1, 0, 1, 1, 0, false, false, false},
 97         {0, U64_MAX, U64_MAX, 1, 0, false, true, false},
 98         {U64_MAX, 0, U64_MAX, U64_MAX, 0, false, false, false},
 99         {1, U64_MAX, 0, 2, U64_MAX, true, true, false},
100         {U64_MAX, 1, 0, U64_MAX-1, U64_MAX, true, false, false},
101         {U64_MAX, U64_MAX, U64_MAX-1, 0, 1, true, false, true},
102 
103         {U64_MAX, U64_MAX-1, U64_MAX-2, 1, 2, true, false, true},
104         {U64_MAX-1, U64_MAX, U64_MAX-2, U64_MAX, 2, true, true, true},
105 
106         {1ULL << 31, 1ULL << 31, 1ULL << 32, 0, 1ULL << 62, false, false, false},
107         {1ULL << 32, 1ULL << 32, 1ULL << 33, 0, 0, false, false, true},
108         {1ULL << 32, 1ULL << 31, 3*(1ULL << 31), 1ULL << 31, 1ULL << 63, false, false, false},
109         {1ULL << 63, 1ULL << 63, 0, 0, 0, true, false, true},
110         {1000000000ULL /* 10^9 */, 10000000000ULL /* 10^10 */,
111          11000000000ULL, 18446744064709551616ULL, 10000000000000000000ULL,
112          false, true, false},
113         {-15ULL, 10ULL, -5ULL, -25ULL, -150ULL, false, false, true},
114 };
115 
116 DEFINE_TEST_ARRAY(s8) = {
117         {0, 0, 0, 0, 0, false, false, false},
118 
119         {0, S8_MAX, S8_MAX, -S8_MAX, 0, false, false, false},
120         {S8_MAX, 0, S8_MAX, S8_MAX, 0, false, false, false},
121         {0, S8_MIN, S8_MIN, S8_MIN, 0, false, true, false},
122         {S8_MIN, 0, S8_MIN, S8_MIN, 0, false, false, false},
123 
124         {-1, S8_MIN, S8_MAX, S8_MAX, S8_MIN, true, false, true},
125         {S8_MIN, -1, S8_MAX, -S8_MAX, S8_MIN, true, false, true},
126         {-1, S8_MAX, S8_MAX-1, S8_MIN, -S8_MAX, false, false, false},
127         {S8_MAX, -1, S8_MAX-1, S8_MIN, -S8_MAX, false, true, false},
128         {-1, -S8_MAX, S8_MIN, S8_MAX-1, S8_MAX, false, false, false},
129         {-S8_MAX, -1, S8_MIN, S8_MIN+2, S8_MAX, false, false, false},
130 
131         {1, S8_MIN, -S8_MAX, -S8_MAX, S8_MIN, false, true, false},
132         {S8_MIN, 1, -S8_MAX, S8_MAX, S8_MIN, false, true, false},
133         {1, S8_MAX, S8_MIN, S8_MIN+2, S8_MAX, true, false, false},
134         {S8_MAX, 1, S8_MIN, S8_MAX-1, S8_MAX, true, false, false},
135 
136         {S8_MIN, S8_MIN, 0, 0, 0, true, false, true},
137         {S8_MAX, S8_MAX, -2, 0, 1, true, false, true},
138 
139         {-4, -32, -36, 28, -128, false, false, true},
140         {-4, 32, 28, -36, -128, false, false, false},
141 };
142 
143 DEFINE_TEST_ARRAY(s16) = {
144         {0, 0, 0, 0, 0, false, false, false},
145 
146         {0, S16_MAX, S16_MAX, -S16_MAX, 0, false, false, false},
147         {S16_MAX, 0, S16_MAX, S16_MAX, 0, false, false, false},
148         {0, S16_MIN, S16_MIN, S16_MIN, 0, false, true, false},
149         {S16_MIN, 0, S16_MIN, S16_MIN, 0, false, false, false},
150 
151         {-1, S16_MIN, S16_MAX, S16_MAX, S16_MIN, true, false, true},
152         {S16_MIN, -1, S16_MAX, -S16_MAX, S16_MIN, true, false, true},
153         {-1, S16_MAX, S16_MAX-1, S16_MIN, -S16_MAX, false, false, false},
154         {S16_MAX, -1, S16_MAX-1, S16_MIN, -S16_MAX, false, true, false},
155         {-1, -S16_MAX, S16_MIN, S16_MAX-1, S16_MAX, false, false, false},
156         {-S16_MAX, -1, S16_MIN, S16_MIN+2, S16_MAX, false, false, false},
157 
158         {1, S16_MIN, -S16_MAX, -S16_MAX, S16_MIN, false, true, false},
159         {S16_MIN, 1, -S16_MAX, S16_MAX, S16_MIN, false, true, false},
160         {1, S16_MAX, S16_MIN, S16_MIN+2, S16_MAX, true, false, false},
161         {S16_MAX, 1, S16_MIN, S16_MAX-1, S16_MAX, true, false, false},
162 
163         {S16_MIN, S16_MIN, 0, 0, 0, true, false, true},
164         {S16_MAX, S16_MAX, -2, 0, 1, true, false, true},
165 };
166 DEFINE_TEST_ARRAY(s32) = {
167         {0, 0, 0, 0, 0, false, false, false},
168 
169         {0, S32_MAX, S32_MAX, -S32_MAX, 0, false, false, false},
170         {S32_MAX, 0, S32_MAX, S32_MAX, 0, false, false, false},
171         {0, S32_MIN, S32_MIN, S32_MIN, 0, false, true, false},
172         {S32_MIN, 0, S32_MIN, S32_MIN, 0, false, false, false},
173 
174         {-1, S32_MIN, S32_MAX, S32_MAX, S32_MIN, true, false, true},
175         {S32_MIN, -1, S32_MAX, -S32_MAX, S32_MIN, true, false, true},
176         {-1, S32_MAX, S32_MAX-1, S32_MIN, -S32_MAX, false, false, false},
177         {S32_MAX, -1, S32_MAX-1, S32_MIN, -S32_MAX, false, true, false},
178         {-1, -S32_MAX, S32_MIN, S32_MAX-1, S32_MAX, false, false, false},
179         {-S32_MAX, -1, S32_MIN, S32_MIN+2, S32_MAX, false, false, false},
180 
181         {1, S32_MIN, -S32_MAX, -S32_MAX, S32_MIN, false, true, false},
182         {S32_MIN, 1, -S32_MAX, S32_MAX, S32_MIN, false, true, false},
183         {1, S32_MAX, S32_MIN, S32_MIN+2, S32_MAX, true, false, false},
184         {S32_MAX, 1, S32_MIN, S32_MAX-1, S32_MAX, true, false, false},
185 
186         {S32_MIN, S32_MIN, 0, 0, 0, true, false, true},
187         {S32_MAX, S32_MAX, -2, 0, 1, true, false, true},
188 };
189 DEFINE_TEST_ARRAY(s64) = {
190         {0, 0, 0, 0, 0, false, false, false},
191 
192         {0, S64_MAX, S64_MAX, -S64_MAX, 0, false, false, false},
193         {S64_MAX, 0, S64_MAX, S64_MAX, 0, false, false, false},
194         {0, S64_MIN, S64_MIN, S64_MIN, 0, false, true, false},
195         {S64_MIN, 0, S64_MIN, S64_MIN, 0, false, false, false},
196 
197         {-1, S64_MIN, S64_MAX, S64_MAX, S64_MIN, true, false, true},
198         {S64_MIN, -1, S64_MAX, -S64_MAX, S64_MIN, true, false, true},
199         {-1, S64_MAX, S64_MAX-1, S64_MIN, -S64_MAX, false, false, false},
200         {S64_MAX, -1, S64_MAX-1, S64_MIN, -S64_MAX, false, true, false},
201         {-1, -S64_MAX, S64_MIN, S64_MAX-1, S64_MAX, false, false, false},
202         {-S64_MAX, -1, S64_MIN, S64_MIN+2, S64_MAX, false, false, false},
203 
204         {1, S64_MIN, -S64_MAX, -S64_MAX, S64_MIN, false, true, false},
205         {S64_MIN, 1, -S64_MAX, S64_MAX, S64_MIN, false, true, false},
206         {1, S64_MAX, S64_MIN, S64_MIN+2, S64_MAX, true, false, false},
207         {S64_MAX, 1, S64_MIN, S64_MAX-1, S64_MAX, true, false, false},
208 
209         {S64_MIN, S64_MIN, 0, 0, 0, true, false, true},
210         {S64_MAX, S64_MAX, -2, 0, 1, true, false, true},
211 
212         {-1, -1, -2, 0, 1, false, false, false},
213         {-1, -128, -129, 127, 128, false, false, false},
214         {-128, -1, -129, -127, 128, false, false, false},
215         {0, -S64_MAX, -S64_MAX, S64_MAX, 0, false, false, false},
216 };
217 
218 #define check_one_op(t, fmt, op, sym, a, b, r, of) do {         \
219         t _r;                                                   \
220         bool _of;                                               \
221                                                                 \
222         _of = check_ ## op ## _overflow(a, b, &_r);             \
223         if (_of != of) {                                        \
224                 pr_warn("expected "fmt" "sym" "fmt              \
225                         " to%s overflow (type %s)\n",           \
226                         a, b, of ? "" : " not", #t);            \
227                 err = 1;                                        \
228         }                                                       \
229         if (_r != r) {                                          \
230                 pr_warn("expected "fmt" "sym" "fmt" == "        \
231                         fmt", got "fmt" (type %s)\n",           \
232                         a, b, r, _r, #t);                       \
233                 err = 1;                                        \
234         }                                                       \
235 } while (0)
236 
237 #define DEFINE_TEST_FUNC(t, fmt)                                        \
238 static int __init do_test_ ## t(const struct test_ ## t *p)             \
239 {                                                                       \
240         int err = 0;                                                    \
241                                                                         \
242         check_one_op(t, fmt, add, "+", p->a, p->b, p->sum, p->s_of);    \
243         check_one_op(t, fmt, add, "+", p->b, p->a, p->sum, p->s_of);    \
244         check_one_op(t, fmt, sub, "-", p->a, p->b, p->diff, p->d_of);   \
245         check_one_op(t, fmt, mul, "*", p->a, p->b, p->prod, p->p_of);   \
246         check_one_op(t, fmt, mul, "*", p->b, p->a, p->prod, p->p_of);   \
247                                                                         \
248         return err;                                                     \
249 }                                                                       \
250                                                                         \
251 static int __init test_ ## t ## _overflow(void) {                       \
252         int err = 0;                                                    \
253         unsigned i;                                                     \
254                                                                         \
255         pr_info("%-3s: %zu tests\n", #t, ARRAY_SIZE(t ## _tests));      \
256         for (i = 0; i < ARRAY_SIZE(t ## _tests); ++i)                   \
257                 err |= do_test_ ## t(&t ## _tests[i]);                  \
258         return err;                                                     \
259 }
260 
261 DEFINE_TEST_FUNC(u8, "%d");
262 DEFINE_TEST_FUNC(s8, "%d");
263 DEFINE_TEST_FUNC(u16, "%d");
264 DEFINE_TEST_FUNC(s16, "%d");
265 DEFINE_TEST_FUNC(u32, "%u");
266 DEFINE_TEST_FUNC(s32, "%d");
267 #if BITS_PER_LONG == 64
268 DEFINE_TEST_FUNC(u64, "%llu");
269 DEFINE_TEST_FUNC(s64, "%lld");
270 #endif
271 
272 static int __init test_overflow_calculation(void)
273 {
274         int err = 0;
275 
276         err |= test_u8_overflow();
277         err |= test_s8_overflow();
278         err |= test_u16_overflow();
279         err |= test_s16_overflow();
280         err |= test_u32_overflow();
281         err |= test_s32_overflow();
282 #if BITS_PER_LONG == 64
283         err |= test_u64_overflow();
284         err |= test_s64_overflow();
285 #endif
286 
287         return err;
288 }
289 
290 /*
291  * Deal with the various forms of allocator arguments. See comments above
292  * the DEFINE_TEST_ALLOC() instances for mapping of the "bits".
293  */
294 #define alloc010(alloc, arg, sz) alloc(sz, GFP_KERNEL)
295 #define alloc011(alloc, arg, sz) alloc(sz, GFP_KERNEL, NUMA_NO_NODE)
296 #define alloc000(alloc, arg, sz) alloc(sz)
297 #define alloc001(alloc, arg, sz) alloc(sz, NUMA_NO_NODE)
298 #define alloc110(alloc, arg, sz) alloc(arg, sz, GFP_KERNEL)
299 #define free0(free, arg, ptr)    free(ptr)
300 #define free1(free, arg, ptr)    free(arg, ptr)
301 
302 /* Wrap around to 8K */
303 #define TEST_SIZE               (9 << PAGE_SHIFT)
304 
305 #define DEFINE_TEST_ALLOC(func, free_func, want_arg, want_gfp, want_node)\
306 static int __init test_ ## func (void *arg)                             \
307 {                                                                       \
308         volatile size_t a = TEST_SIZE;                                  \
309         volatile size_t b = (SIZE_MAX / TEST_SIZE) + 1;                 \
310         void *ptr;                                                      \
311                                                                         \
312         /* Tiny allocation test. */                                     \
313         ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg, 1);\
314         if (!ptr) {                                                     \
315                 pr_warn(#func " failed regular allocation?!\n");        \
316                 return 1;                                               \
317         }                                                               \
318         free ## want_arg (free_func, arg, ptr);                         \
319                                                                         \
320         /* Wrapped allocation test. */                                  \
321         ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg,    \
322                                                           a * b);       \
323         if (!ptr) {                                                     \
324                 pr_warn(#func " unexpectedly failed bad wrapping?!\n"); \
325                 return 1;                                               \
326         }                                                               \
327         free ## want_arg (free_func, arg, ptr);                         \
328                                                                         \
329         /* Saturated allocation test. */                                \
330         ptr = alloc ## want_arg ## want_gfp ## want_node (func, arg,    \
331                                                    array_size(a, b));   \
332         if (ptr) {                                                      \
333                 pr_warn(#func " missed saturation!\n");                 \
334                 free ## want_arg (free_func, arg, ptr);                 \
335                 return 1;                                               \
336         }                                                               \
337         pr_info(#func " detected saturation\n");                        \
338         return 0;                                                       \
339 }
340 
341 /*
342  * Allocator uses a trailing node argument --------+  (e.g. kmalloc_node())
343  * Allocator uses the gfp_t argument -----------+  |  (e.g. kmalloc())
344  * Allocator uses a special leading argument +  |  |  (e.g. devm_kmalloc())
345  *                                           |  |  |
346  */
347 DEFINE_TEST_ALLOC(kmalloc,       kfree,      0, 1, 0);
348 DEFINE_TEST_ALLOC(kmalloc_node,  kfree,      0, 1, 1);
349 DEFINE_TEST_ALLOC(kzalloc,       kfree,      0, 1, 0);
350 DEFINE_TEST_ALLOC(kzalloc_node,  kfree,      0, 1, 1);
351 DEFINE_TEST_ALLOC(vmalloc,       vfree,      0, 0, 0);
352 DEFINE_TEST_ALLOC(vmalloc_node,  vfree,      0, 0, 1);
353 DEFINE_TEST_ALLOC(vzalloc,       vfree,      0, 0, 0);
354 DEFINE_TEST_ALLOC(vzalloc_node,  vfree,      0, 0, 1);
355 DEFINE_TEST_ALLOC(kvmalloc,      kvfree,     0, 1, 0);
356 DEFINE_TEST_ALLOC(kvmalloc_node, kvfree,     0, 1, 1);
357 DEFINE_TEST_ALLOC(kvzalloc,      kvfree,     0, 1, 0);
358 DEFINE_TEST_ALLOC(kvzalloc_node, kvfree,     0, 1, 1);
359 DEFINE_TEST_ALLOC(devm_kmalloc,  devm_kfree, 1, 1, 0);
360 DEFINE_TEST_ALLOC(devm_kzalloc,  devm_kfree, 1, 1, 0);
361 
362 static int __init test_overflow_allocation(void)
363 {
364         const char device_name[] = "overflow-test";
365         struct device *dev;
366         int err = 0;
367 
368         /* Create dummy device for devm_kmalloc()-family tests. */
369         dev = root_device_register(device_name);
370         if (IS_ERR(dev)) {
371                 pr_warn("Cannot register test device\n");
372                 return 1;
373         }
374 
375         err |= test_kmalloc(NULL);
376         err |= test_kmalloc_node(NULL);
377         err |= test_kzalloc(NULL);
378         err |= test_kzalloc_node(NULL);
379         err |= test_kvmalloc(NULL);
380         err |= test_kvmalloc_node(NULL);
381         err |= test_kvzalloc(NULL);
382         err |= test_kvzalloc_node(NULL);
383         err |= test_vmalloc(NULL);
384         err |= test_vmalloc_node(NULL);
385         err |= test_vzalloc(NULL);
386         err |= test_vzalloc_node(NULL);
387         err |= test_devm_kmalloc(dev);
388         err |= test_devm_kzalloc(dev);
389 
390         device_unregister(dev);
391 
392         return err;
393 }
394 
395 static int __init test_module_init(void)
396 {
397         int err = 0;
398 
399         err |= test_overflow_calculation();
400         err |= test_overflow_allocation();
401 
402         if (err) {
403                 pr_warn("FAIL!\n");
404                 err = -EINVAL;
405         } else {
406                 pr_info("all tests passed\n");
407         }
408 
409         return err;
410 }
411 
412 static void __exit test_module_exit(void)
413 { }
414 
415 module_init(test_module_init);
416 module_exit(test_module_exit);
417 MODULE_LICENSE("Dual MIT/GPL");
418 

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