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Date:   Wed,  1 May 2019 14:41:58 +0100
From:   Colin King <>
To:     Pravin B Shelar <>,
        "David S . Miller" <>,,
Subject: [PATCH][next] openvswitch: check for null pointer return from nla_nest_start_noflag

From: Colin Ian King <>

The call to nla_nest_start_noflag can return null in the unlikely
event that nla_put returns -EMSGSIZE.  Check for this condition to
avoid a null pointer dereference on pointer nla_reply.

Addresses-Coverity: ("Dereference null return value")
Fixes: 11efd5cb04a1 ("openvswitch: Support conntrack zone limit")
Signed-off-by: Colin Ian King <>
 net/openvswitch/conntrack.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index c4128082f88b..333ec5f298fe 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -2175,6 +2175,10 @@ static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
 		return PTR_ERR(reply);
 	nla_reply = nla_nest_start_noflag(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
+	if (!nla_reply) {
+		err = -EMSGSIZE;
+		goto exit_err;
+	}
 		err = ovs_ct_limit_get_zone_limit(

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