Subject: [PATCH] netfilter: Fix error in ipq_enqueue_packet

From: Krishna Kumar <[email-masked]>
Date: Wed, 02 May 2012 11:40:29 +0530

ipq_enqueue_packet sets status=-EINVAL and calls
ipq_build_packet_message(entry, &status). This can
set status=0 while returning an skb. The next line:
	if (!peer_pid)
		goto err_out_free_nskb;
which wrongly returns success.

Signed-off-by: Krishna Kumar <[email-masked]>
---
 net/ipv4/netfilter/ip_queue.c  |    6 ++++--
 net/ipv6/netfilter/ip6_queue.c |    6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff -ruNp org/net/ipv4/netfilter/ip_queue.c new/net/ipv4/netfilter/ip_queue.c
--- org/net/ipv4/netfilter/ip_queue.c	2012-04-23 08:28:23.000000000 +0530
+++ new/net/ipv4/netfilter/ip_queue.c	2012-05-02 11:28:33.899790397 +0530
@@ -227,7 +227,7 @@ nlmsg_failure:
 static int
 ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
 {
-	int status = -EINVAL;
+	int status;
 	struct sk_buff *nskb;
 
 	if (copy_mode == IPQ_COPY_NONE)
@@ -239,8 +239,10 @@ ipq_enqueue_packet(struct nf_queue_entry
 
 	spin_lock_bh(&queue_lock);
 
-	if (!peer_pid)
+	if (!peer_pid) {
+		status = -EINVAL;
 		goto err_out_free_nskb;
+	}
 
 	if (queue_total >= queue_maxlen) {
 		queue_dropped++;
diff -ruNp org/net/ipv6/netfilter/ip6_queue.c new/net/ipv6/netfilter/ip6_queue.c
--- org/net/ipv6/netfilter/ip6_queue.c	2012-04-23 08:28:23.000000000 +0530
+++ new/net/ipv6/netfilter/ip6_queue.c	2012-05-02 11:30:21.199578311 +0530
@@ -227,7 +227,7 @@ nlmsg_failure:
 static int
 ipq_enqueue_packet(struct nf_queue_entry *entry, unsigned int queuenum)
 {
-	int status = -EINVAL;
+	int status;
 	struct sk_buff *nskb;
 
 	if (copy_mode == IPQ_COPY_NONE)
@@ -239,8 +239,10 @@ ipq_enqueue_packet(struct nf_queue_entry
 
 	spin_lock_bh(&queue_lock);
 
-	if (!peer_pid)
+	if (!peer_pid) {
+		status = -EINVAL;
 		goto err_out_free_nskb;
+	}
 
 	if (queue_total >= queue_maxlen) {
 		queue_dropped++;