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authorTianyu Li <tianyu.li@arm.com>2022-06-01 12:32:11 +0300
committerakpm <akpm@linux-foundation.org>2022-07-04 04:08:39 +0300
commit000eca5d044d1ee23b4ca311793cf3fc528da6c6 (patch)
treec7c6c6574409f06dd8fc55becb3ca855dcfc4516 /mm/mempolicy.c
parent8edaec0756005a3f286c9272e909dff07d12cf75 (diff)
downloadlinux-000eca5d044d1ee23b4ca311793cf3fc528da6c6.tar.xz
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: e130242dc351 ("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>
Diffstat (limited to 'mm/mempolicy.c')
-rw-r--r--mm/mempolicy.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 9689919a2829..f4cd963550c1 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1388,7 +1388,7 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask,
unsigned long bits = min_t(unsigned long, maxnode, BITS_PER_LONG);
unsigned long t;
- if (get_bitmap(&t, &nmask[maxnode / BITS_PER_LONG], bits))
+ if (get_bitmap(&t, &nmask[(maxnode - 1) / BITS_PER_LONG], bits))
return -EFAULT;
if (maxnode - bits >= MAX_NUMNODES) {