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| -rw-r--r-- | src/malloc/malloc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/malloc/malloc.c b/src/malloc/malloc.c index 6605ec3a..991300cc 100644 --- a/src/malloc/malloc.c +++ b/src/malloc/malloc.c @@ -563,6 +563,9 @@ void __malloc_donate(char *start, char *end) size_t align_start_up = (SIZE_ALIGN-1) & (-(uintptr_t)start - OVERHEAD); size_t align_end_down = (SIZE_ALIGN-1) & (uintptr_t)end; + /* Getting past this condition ensures that the padding for alignment + * and header overhead will not overflow and will leave a nonzero + * multiple of SIZE_ALIGN bytes between start and end. */ if (end - start <= OVERHEAD + align_start_up + align_end_down) return; start += align_start_up + OVERHEAD; |