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| author | Will Newton <will.newton@linaro.org> | 2013-08-16 11:59:37 +0100 |
|---|---|---|
| committer | Will Newton <will.newton@linaro.org> | 2013-09-11 09:41:04 +0100 |
| commit | 55e17aadc1ef17a1df9626fb0e9fba290ece3331 (patch) | |
| tree | 535a0430dd472b5e4059b71b1109312a5d3a59a9 | |
| parent | 1159a193696ad48ec86e5895f6dee3e539619c0e (diff) | |
| download | glibc-55e17aadc1ef17a1df9626fb0e9fba290ece3331.tar glibc-55e17aadc1ef17a1df9626fb0e9fba290ece3331.tar.gz glibc-55e17aadc1ef17a1df9626fb0e9fba290ece3331.tar.bz2 glibc-55e17aadc1ef17a1df9626fb0e9fba290ece3331.zip | |
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.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | malloc/malloc.c | 7 |
2 files changed, 13 insertions, 0 deletions
@@ -1,5 +1,11 @@ 2013-09-11 Will Newton <will.newton@linaro.org> + [BZ #15856] + * malloc/malloc.c (__libc_valloc): Check the value of bytes + does not overflow. + +2013-09-11 Will Newton <will.newton@linaro.org> + [BZ #15855] * malloc/malloc.c (__libc_pvalloc): Check the value of bytes does not overflow. 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)) |