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From: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
To: Jesse Gross <jesse-l0M0P4e3n4LQT0dZR+AlfA@public.gmane.org>
Cc: dev-yBygre7rU0TnMu66kgdUjQ@public.gmane.org,
	netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"David S. Miller" <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
Subject: [patch] openvswitch: potential NULL deref in sample()
Date: Mon, 23 Jul 2012 10:46:28 +0300	[thread overview]
Message-ID: <20120723074628.GA30892@elgon.mountain> (raw)

If there is no OVS_SAMPLE_ATTR_ACTIONS set then "acts_list" is NULL and
it leads to a NULL dereference when we call nla_len(acts_list).  This
is a static checker fix, not something I have seen in testing.

Signed-off-by: Dan Carpenter <dan.carpenter-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
This applies to Linus's tree.

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 48badff..c2351d6 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -325,6 +325,9 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
 		}
 	}
 
+	if (!acts_list)
+		return 0;
+
 	return do_execute_actions(dp, skb, nla_data(acts_list),
 						 nla_len(acts_list), true);
 }

             reply	other threads:[~2012-07-23  7:46 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-07-23  7:46 Dan Carpenter [this message]
     [not found] ` <20120723074628.GA30892-mgFCXtclrQlZLf2FXnZxJA@public.gmane.org>
2012-07-23  8:00   ` [patch] openvswitch: potential NULL deref in sample() David Miller
2012-07-23 19:54   ` Jesse Gross

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