[PATCH] sys_set_mempolicy() doesnt check if mode < 0
A kernel BUG() is triggered by a call to set_mempolicy() with a negative
first argument. This is because the mode is declared as an int, and the
validity check doesnt check < 0 values. Alternatively, mode could be
declared as unsigned int or unsigned long.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 1694845..b4eabab 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -443,7 +443,7 @@
struct mempolicy *new;
DECLARE_BITMAP(nodes, MAX_NUMNODES);
- if (mode > MPOL_MAX)
+ if (mode < 0 || mode > MPOL_MAX)
return -EINVAL;
err = get_nodes(nodes, nmask, maxnode, mode);
if (err)