netdev - [PATCH v2] xfrm: Use __skb_queue_tail in xfrm_trans

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Date:   Thu, 4 Jan 2018 22:25:07 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Artem Savkov <asavkov@...hat.com>
Cc:     Steffen Klassert <steffen.klassert@...unet.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] xfrm: Use __skb_queue_tail in xfrm_trans_queue

On Thu, Jan 04, 2018 at 12:20:26PM +0100, Artem Savkov wrote:

> Right, thats a better solution.
> 
> Reported-and-tested-by: Artem Savkov <asavkov@...hat.com>

Thanks!

But I just realised that this patch is based on my dirty tree.
So here is a rebased version:

---8<---
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>

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 444fa37..9dbf425 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -508,7 +508,7 @@ 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;
 }
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt