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authorWill Newton <will.newton@linaro.org>2013-08-16 11:59:37 +0100
committerWill Newton <will.newton@linaro.org>2013-09-11 09:41:04 +0100
commit55e17aadc1ef17a1df9626fb0e9fba290ece3331 (patch)
tree535a0430dd472b5e4059b71b1109312a5d3a59a9 /malloc
parent1159a193696ad48ec86e5895f6dee3e539619c0e (diff)
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malloc: Check for integer overflow in valloc.
A large bytes parameter to valloc could cause an integer overflow and corrupt allocator internals. Check the overflow does not occur before continuing with the allocation. ChangeLog: 2013-09-11 Will Newton <will.newton@linaro.org> [BZ #15856] * malloc/malloc.c (__libc_valloc): Check the value of bytes does not overflow.
Diffstat (limited to 'malloc')
-rw-r--r--malloc/malloc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 7f43ba3b8f..3148c5f57d 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -3046,6 +3046,13 @@ __libc_valloc(size_t bytes)
size_t pagesz = GLRO(dl_pagesize);
+ /* Check for overflow. */
+ if (bytes > SIZE_MAX - pagesz - MINSIZE)
+ {
+ __set_errno (ENOMEM);
+ return 0;
+ }
+
void *(*hook) (size_t, size_t, const void *) =
force_reg (__memalign_hook);
if (__builtin_expect (hook != NULL, 0))