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cpumask: fix slab corruption caused by alloc_cpumask_var_node()

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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 <[email protected]>
Acked-by: Mike Travis <travis.sgi.com>
Acked-by: Ingo Molnar <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: <[email protected]>		[2.6.29.x]
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jack Steiner 2009-04-02 16:59:48 -07:00 • committed by Linus Torvalds
commit 4f032ac412
1 changed files with 2 additions and 2 deletions
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4
lib/cpumask.c
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@ -109,10 +109,10 @@ bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node)
#endif
/* FIXME: Bandaid to save us from old primitives which go to NR_CPUS. */
if (*mask) {
unsigned char *ptr = (unsigned char *)cpumask_bits(*mask);
unsigned int tail;
tail = BITS_TO_LONGS(NR_CPUS - nr_cpumask_bits) * sizeof(long);
memset(cpumask_bits(*mask) + cpumask_size() - tail,
0, tail);
memset(ptr + cpumask_size() - tail, 0, tail);
}
return *mask != NULL;