netdev - [PATCH] isdn: avm: Handle return value of skb

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Message-Id: <5818ec104ed4354db3625ac8c7741d771719e4d4.1513453258.git.arvind.yadav.cs@gmail.com>
Date:   Sun, 17 Dec 2017 01:17:23 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     isdn@...ux-pingi.de, stephen@...workplumber.org,
        davem@...emloft.net, johannes.berg@...el.com
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH] isdn: avm: Handle return value of skb_dequeue()

skb_dequeue() will return NULL for an empty list or a pointer
to the head element.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
---
 drivers/isdn/hardware/avm/b1dma.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/isdn/hardware/avm/b1dma.c b/drivers/isdn/hardware/avm/b1dma.c
index 9538a9e..10df578 100644
--- a/drivers/isdn/hardware/avm/b1dma.c
+++ b/drivers/isdn/hardware/avm/b1dma.c
@@ -375,6 +375,8 @@ static void b1dma_dispatch_tx(avmcard *card)
 	void *p;
 
 	skb = skb_dequeue(&dma->send_queue);
+	if (!skb)
+		return;
 
 	len = CAPIMSG_LEN(skb->data);
 
-- 
2.7.4