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mem_calloc: check for mem_size_t overflow when multiplying 2 mem_size_t input values

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This commit is contained in:
goldsimon 2017-04-04 21:52:01 +02:00
parent 6fe66771cb
commit e65a0950b2
1 changed files with 8 additions and 2 deletions
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10
src/core/mem.c
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@ -765,12 +765,18 @@ void *
mem_calloc(mem_size_t count, mem_size_t size) mem_calloc(mem_size_t count, mem_size_t size)
{ {
void *p; void *p;
size_t alloc_size = (size_t)count * (size_t)size;
if ((size_t)(mem_size_t)alloc_size != alloc_size) {
LWIP_DEBUGF(MEM_DEBUG | LWIP_DBG_LEVEL_SERIOUS, ("mem_calloc: could not allocate %"SZT_F" bytes\n", alloc_size));
return NULL;
}
/* allocate 'count' objects of size 'size' */ /* allocate 'count' objects of size 'size' */
p = mem_malloc(count * size); p = mem_malloc((mem_size_t)alloc_size);
if (p) { if (p) {
/* zero the memory */ /* zero the memory */
memset(p, 0, (size_t)count * (size_t)size); memset(p, 0, alloc_size);
} }
return p; return p;
} }