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[PATCH] sys_mbind sanity checking

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Make sure maxnodes is safe size before calculating nlongs in
get_nodes().

Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chris Wright
2006-02-17 13:59:36 -08:00
committed by Linus Torvalds
parent 74910e6c7d
commit 636f13c174
1 changed files with 2 additions and 0 deletions
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2
mm/mempolicy.c
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@@ -808,6 +808,8 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask,
nodes_clear(*nodes); nodes_clear(*nodes);
if (maxnode == 0 || !nmask) if (maxnode == 0 || !nmask)
return 0; return 0;
if (maxnode > PAGE_SIZE)
return -EINVAL;
nlongs = BITS_TO_LONGS(maxnode); nlongs = BITS_TO_LONGS(maxnode);
if ((maxnode % BITS_PER_LONG) == 0) if ((maxnode % BITS_PER_LONG) == 0)