netdev - [PATCH 08/17] br2684: don't send frames on not-ready vcc

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Message-Id: <1354235736-26833-9-git-send-email-dwmw2@infradead.org>
Date:	Fri, 30 Nov 2012 00:35:27 +0000
From:	David Woodhouse <dwmw2@...radead.org>
To:	netdev@...r.kernel.org
Cc:	chas@....nrl.navy.mil, krzysiek@...lesie.net,
	David Woodhouse <dwmw2@...radead.org>,
	David Woodhouse <David.Woodhouse@...el.com>
Subject: [PATCH 08/17] br2684: don't send frames on not-ready vcc

Avoid submitting packets to a vcc which is being closed. Things go badly
wrong when the ->pop method gets later called after everything's been
torn down.

Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
Acked-by: Krzysztof Mazur <krzysiek@...lesie.net>
---
 net/atm/br2684.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/atm/br2684.c b/net/atm/br2684.c
index 8eb6fbe..c483021 100644
--- a/net/atm/br2684.c
+++ b/net/atm/br2684.c
@@ -249,6 +249,12 @@ static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev,
 	skb_debug(skb);
 
 	ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc;
+	if (test_bit(ATM_VF_RELEASED, &atmvcc->flags) ||
+	    test_bit(ATM_VF_CLOSE, &atmvcc->flags) ||
+	    !test_bit(ATM_VF_READY, &atmvcc->flags)) {
+		dev_kfree_skb(skb);
+		return 0;
+	}
 	pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev);
 	atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc);
 	ATM_SKB(skb)->atm_options = atmvcc->atm_options;
-- 
1.8.0

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