netdev - [PATCH 7/7] xfrm: check for a vaild skb in xfrm_policy_queue

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Date:	Wed,  9 Oct 2013 12:59:11 +0200
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	David Miller <davem@...emloft.net>
Cc:	Herbert Xu <herbert@...dor.apana.org.au>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	netdev@...r.kernel.org
Subject: [PATCH 7/7] xfrm: check for a vaild skb in xfrm_policy_queue_process

We might dreference a NULL pointer if the hold_queue is empty,
so add a check to avoid this.

Bug was introduced with git commit a0073fe18 ("xfrm: Add a state
resolution packet queue")

Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 net/xfrm/xfrm_policy.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 5f9be97..76e1873 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1772,6 +1772,10 @@ static void xfrm_policy_queue_process(unsigned long arg)
 
 	spin_lock(&pq->hold_queue.lock);
 	skb = skb_peek(&pq->hold_queue);
+	if (!skb) {
+		spin_unlock(&pq->hold_queue.lock);
+		goto out;
+	}
 	dst = skb_dst(skb);
 	sk = skb->sk;
 	xfrm_decode_session(skb, &fl, dst->ops->family);
-- 
1.7.9.5

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