From: Harald Welte <laforge@netfilter.org>
Date: Thu, 3 Nov 2005 18:05:37 +0000 (+0100)
Subject: [NETFILTER]: Fix double free after netlink_unicast() in ctnetlink
X-Git-Tag: firefly_0821_release~40576^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0f81eb4db4f1cc560318b6e7762a7a1d7d8c7095;p=firefly-linux-kernel-4.4.55.git

[NETFILTER]: Fix double free after netlink_unicast() in ctnetlink

It's not necessary to free skb if netlink_unicast() failed.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
---

diff --git a/net/ipv4/netfilter/ip_conntrack_netlink.c b/net/ipv4/netfilter/ip_conntrack_netlink.c
index 166e6069f121..82a65043a8ef 100644
--- a/net/ipv4/netfilter/ip_conntrack_netlink.c
+++ b/net/ipv4/netfilter/ip_conntrack_netlink.c
@@ -815,7 +815,7 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 				  IPCTNL_MSG_CT_NEW, 1, ct);
 	ip_conntrack_put(ct);
 	if (err <= 0)
-		goto out;
+		goto free;
 
 	err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 	if (err < 0)
@@ -824,9 +824,9 @@ ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb,
 	DEBUGP("leaving\n");
 	return 0;
 
+free:
+	kfree_skb(skb2);
 out:
-	if (skb2)
-		kfree_skb(skb2);
 	return -1;
 }
 
@@ -1322,21 +1322,16 @@ ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb,
 				      nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW,
 				      1, exp);
 	if (err <= 0)
-		goto out;
+		goto free;
 
 	ip_conntrack_expect_put(exp);
 
-	err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
-	if (err < 0)
-		goto free;
-
-	return err;
+	return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT);
 
+free:
+	kfree_skb(skb2);
 out:
 	ip_conntrack_expect_put(exp);
-free:
-	if (skb2)
-		kfree_skb(skb2);
 	return err;
 }