malloc: Check for integer overflow in memalign.

A large bytes parameter to memalign 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 #15857]
	* malloc/malloc.c (__libc_memalign): Check the value of bytes
	does not overflow.

1 files changed, 6 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index 2c9dc89..14760a2 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -337,6 +337,12 @@
 
 2013-09-11  Will Newton  <will.newton@linaro.org>
 
+	[BZ #15857]
+	* malloc/malloc.c (__libc_memalign): Check the value of bytes
+	does not overflow.
+
+2013-09-11  Will Newton  <will.newton@linaro.org>
+
 	[BZ #15856]
 	* malloc/malloc.c (__libc_valloc): Check the value of bytes
 	does not overflow.