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[PATCH] sys_set_mempolicy() doesnt check if mode < 0

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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 <[email protected]>
Cc: Andi Kleen <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Eric Dumazet 2005-08-01 21:11:43 -07:00 • committed by Linus Torvalds
commit ba17101b41
1 changed files with 1 additions and 1 deletions
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2
mm/mempolicy.c
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@ -443,7 +443,7 @@ asmlinkage long sys_set_mempolicy(int mode, unsigned long __user *nmask,
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)