netdev - [PATCHv4 net 2/6] openvswitch: Fix skb leak in ovs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1444154401-18029-3-git-send-email-joestringer@nicira.com>
Date:	Tue,  6 Oct 2015 10:59:57 -0700
From:	Joe Stringer <joestringer@...ira.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, pshelar@...ira.com
Subject: [PATCHv4 net 2/6] openvswitch: Fix skb leak in ovs_fragment()

If ovs_fragment() was unable to fragment the skb due to an L2 header
that exceeds the supported length, skbs would be leaked. Fix the bug.

Fixes: 7f8a436eaa2c "openvswitch: Add conntrack action"
Signed-off-by: Joe Stringer <joestringer@...ira.com>
Acked-by: Pravin B Shelar <pshelar@...ira.com>
---
v4: Extend "fixes" hash in commit message.
v3: Acked.
v2: Drop if condition by returning in success case.
---
 net/openvswitch/actions.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index e23a61cc3d5c..4cb93f92d6be 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -684,7 +684,7 @@ static void ovs_fragment(struct vport *vport, struct sk_buff *skb, u16 mru,
 {
 	if (skb_network_offset(skb) > MAX_L2_LEN) {
 		OVS_NLERR(1, "L2 header too long to fragment");
-		return;
+		goto err;
 	}
 
 	if (ethertype == htons(ETH_P_IP)) {
@@ -708,8 +708,7 @@ static void ovs_fragment(struct vport *vport, struct sk_buff *skb, u16 mru,
 		struct rt6_info ovs_rt;
 
 		if (!v6ops) {
-			kfree_skb(skb);
-			return;
+			goto err;
 		}
 
 		prepare_frag(vport, skb);
@@ -728,8 +727,12 @@ static void ovs_fragment(struct vport *vport, struct sk_buff *skb, u16 mru,
 		WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
 			  ovs_vport_name(vport), ntohs(ethertype), mru,
 			  vport->dev->mtu);
-		kfree_skb(skb);
+		goto err;
 	}
+
+	return;
+err:
+	kfree_skb(skb);
 }
 
 static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
-- 
2.1.4

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html