linux-kernel - [PATCH 2/2] isdn: correctly check failed allocation

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Date:	Thu, 15 Oct 2015 12:29:28 -0400
From:	Insu Yun <wuninsu@...il.com>
To:	isdn@...ux-pingi.de, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	taesoo@...ech.edu, yeongjin.jang@...ech.edu, insu@...ech.edu,
	Insu Yun <wuninsu@...il.com>
Subject: [PATCH 2/2] isdn: correctly check failed allocation

Since skb_clone is memory allocation, it could be failed when lack of resource.
Therefore, return value of skb_clone needs to be checked and handle error.

Signed-off-by: Insu Yun <wuninsu@...il.com>
---
 drivers/isdn/mISDN/layer2.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/isdn/mISDN/layer2.c b/drivers/isdn/mISDN/layer2.c
index 949cabb..888c610 100644
--- a/drivers/isdn/mISDN/layer2.c
+++ b/drivers/isdn/mISDN/layer2.c
@@ -1509,6 +1509,12 @@ l2_pull_iqueue(struct FsmInst *fi, int event, void *arg)
 	}
 
 	nskb = skb_clone(skb, GFP_ATOMIC);
+  if (!nskb) {
+			printk(KERN_WARNING "%s: no skb mem in %s\n",
+			       mISDNDevName4ch(&l2->ch), __func__);
+			return;
+  }
+
 	p1 = skb_headroom(nskb);
 	if (p1 >= i)
 		memcpy(skb_push(nskb, i), header, i);
-- 
1.9.1

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