linux-kernel - [PATCH 3.16 172/254] xfrm: Use __skb_queue_tail in xfrm_trans

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Date:   Wed, 28 Feb 2018 15:20:18 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Steffen Klassert" <steffen.klassert@...unet.com>,
        "Herbert Xu" <herbert@...dor.apana.org.au>
Subject: [PATCH 3.16 172/254] xfrm: Use __skb_queue_tail in xfrm_trans_queue

3.16.55-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Herbert Xu <herbert@...dor.apana.org.au>

commit d16b46e4fd8bc6063624605f25b8c0835bb1fbe3 upstream.

We do not need locking in xfrm_trans_queue because it is designed
to use per-CPU buffers.  However, the original code incorrectly
used skb_queue_tail which takes the lock.  This patch switches
it to __skb_queue_tail instead.

Reported-and-tested-by: Artem Savkov <asavkov@...hat.com>
Fixes: acf568ee859f ("xfrm: Reinject transport-mode packets...")
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/xfrm/xfrm_input.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -414,7 +414,7 @@ int xfrm_trans_queue(struct sk_buff *skb
 		return -ENOBUFS;
 
 	XFRM_TRANS_SKB_CB(skb)->finish = finish;
-	skb_queue_tail(&trans->queue, skb);
+	__skb_queue_tail(&trans->queue, skb);
 	tasklet_schedule(&trans->tasklet);
 	return 0;
 }