[PATCH] sysctl: fix binary sysctl overflow

[Lucian Adrian Grijincu]

We allocated a vector of CTL_MAXNAME elements and considered
[0, CTL_MAXNAME] as valid indexes in the vector.

This fixes valid index range to be [0, CTL_MAXNAME).

I guess this should be backported to stable trees too.

Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@xxxxxxxxx>
---
 kernel/sysctl_binary.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/sysctl_binary.c b/kernel/sysctl_binary.c
index b875bed..e2f377c 100644
--- a/kernel/sysctl_binary.c
+++ b/kernel/sysctl_binary.c
@@ -1446,7 +1446,7 @@ static ssize_t do_sysctl(int __user *args_name, int nlen,
 	int i;
 
 	/* Check args->nlen. */
-	if (nlen < 0 || nlen > CTL_MAXNAME)
+	if (nlen < 0 || nlen >= CTL_MAXNAME)
 		return -ENOTDIR;
 	/* Read in the sysctl name for simplicity */
 	for (i = 0; i < nlen; i++)
-- 
1.7.4.rc1.7.g2cf08.dirty

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