[Devel] [PATCH 1/4] Fix acquiring socket lock before reading RTNETLINK response

[Dan Smith]

Signed-off-by: Dan Smith <danms at us.ibm.com>
---
 net/checkpoint_dev.c |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/net/checkpoint_dev.c b/net/checkpoint_dev.c
index 7ccb899..2787892 100644
--- a/net/checkpoint_dev.c
+++ b/net/checkpoint_dev.c
@@ -136,11 +136,12 @@ static struct nlmsghdr *rtnl_get_response(struct socket *rtnl,
 
 	*skb = NULL;
 
+	lock_sock(rtnl->sk);
 	ret = sk_wait_data(rtnl->sk, &timeo);
-	if (!ret)
-		return ERR_PTR(-EPIPE);
+	if (ret)
+		*skb = skb_dequeue(&rtnl->sk->sk_receive_queue);
+	release_sock(rtnl->sk);
 
-	*skb = skb_dequeue(&rtnl->sk->sk_receive_queue);
 	if (!*skb)
 		return ERR_PTR(-EPIPE);
 
-- 
1.6.2.5

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