linux-kernel - [PATCH] sysctl: fix min/max handling in __do_proc_doulongvec

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Date:	Sat, 02 Oct 2010 15:17:49 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Robin Holt <holt@....com>, Willy Tarreau <w@....eu>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>, netdev@...r.kernel.org,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	Patrick McHardy <kaber@...sh.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>
Subject: [PATCH] sysctl: fix min/max handling in
 __do_proc_doulongvec_minmax()

When proc_doulongvec_minmax() is used with an array of longs,
and no min/max check requested (.extra1 or .extra2 being NULL), we
dereference a NULL pointer for the second element of the array.

Noticed while doing some changes in network stack for the "16TB problem"

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
---
 kernel/sysctl.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index f88552c..4fba86d 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2500,7 +2500,8 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
 				break;
 			if (neg)
 				continue;
-			if ((min && val < *min) || (max && val > *max))
+			if ((table->extra1 && val < *min) ||
+			    (table->extra2 && val > *max))
 				continue;
 			*i = val;
 		} else {


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