[patch 1/8] [PATCH] sys_set_mempolicy() doesnt check if mode < 0

[Chris Wright <chrisw@osdl.org>]

[-- Attachment #1: sys_set_mempolicy-mode-check.patch --]
[-- Type: text/plain, Size: 1098 bytes --]

-stable review patch.  If anyone has any  objections, please let us know.
------------------


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>
Signed-off-by: Chris Wright <chrisw@osdl.org>
---
 mm/mempolicy.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

Index: linux-2.6.12.y/mm/mempolicy.c
===================================================================
--- linux-2.6.12.y.orig/mm/mempolicy.c
+++ linux-2.6.12.y/mm/mempolicy.c
@@ -409,7 +409,7 @@ asmlinkage long sys_set_mempolicy(int mo
 	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)

--