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| author | Chris Wright <chrisw@sous-sol.org> | 2006-02-17 13:59:36 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-17 14:09:22 -0800 |
| commit | 636f13c174dd7c84a437d3c3e8fa66f03f7fda63 (patch) | |
| tree | 2dd28d7729a52655eb4e155af620c5afdda85a8a /mm/mempolicy.c | |
| parent | 74910e6c7dc7471b286a883c1a7af70483ffd2ba (diff) | |
| download | lwn-636f13c174dd7c84a437d3c3e8fa66f03f7fda63.tar.gz lwn-636f13c174dd7c84a437d3c3e8fa66f03f7fda63.zip | |
[PATCH] sys_mbind sanity checking
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>
Diffstat (limited to 'mm/mempolicy.c')
| -rw-r--r-- | mm/mempolicy.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 323fdcf128c4..bedfa4f09c80 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -808,6 +808,8 @@ static int get_nodes(nodemask_t *nodes, const unsigned long __user *nmask, nodes_clear(*nodes); if (maxnode == 0 || !nmask) return 0; + if (maxnode > PAGE_SIZE) + return -EINVAL; nlongs = BITS_TO_LONGS(maxnode); if ((maxnode % BITS_PER_LONG) == 0) |