cpumask: fix slab corruption caused by alloc_cpumask_var_node()
authorJack Steiner <steiner@sgi.com>
Thu, 2 Apr 2009 23:59:48 +0000 (16:59 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 3 Apr 2009 02:05:11 +0000 (19:05 -0700)
commit4f032ac4122a77dbabf7a24b2739b2790448180f
tree6a56afe2e32f346f2d24ac592a7cfdd0263c1629
parent2d09cde985702503970d7cc18d762fae17e1cf88
cpumask: fix slab corruption caused by alloc_cpumask_var_node()

Fix slab corruption caused by alloc_cpumask_var_node() overwriting the
tail end of an off-stack cpumask.

The function zeros out cpumask bits beyond the last possible cpu.  The
starting point for zeroing should be the beginning of the mask offset by a
byte count derived from the number of possible cpus.  The offset was
calculated in bits instead of bytes.  This resulted in overwriting the end
of the cpumask.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Acked-by: Mike Travis <travis.sgi.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: <stable@kernel.org> [2.6.29.x]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
lib/cpumask.c