mm/mempolicy: fix get_nodes out of bound access
When user specified more nodes than supported, get_nodes will access nmask
array out of bounds.
Link: https://lkml.kernel.org/r/20220601093211.2970565-1-tianyu.li@arm.com
Fixes: e130242dc3
("mm: simplify compat numa syscalls")
Signed-off-by: Tianyu Li <tianyu.li@arm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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@ -1388,7 +1388,7 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask,
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unsigned long bits = min_t(unsigned long, maxnode, BITS_PER_LONG);
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unsigned long t;
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if (get_bitmap(&t, &nmask[maxnode / BITS_PER_LONG], bits))
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if (get_bitmap(&t, &nmask[(maxnode - 1) / BITS_PER_LONG], bits))
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return -EFAULT;
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if (maxnode - bits >= MAX_NUMNODES) {
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