netdev - [PATCH] caif: fix a potential NULL dereference

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Date:	Fri, 02 Sep 2011 14:19:23 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sjur Brændeland <sjurbren@...il.com>,
	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH]  caif: fix a potential NULL dereference

Commit bd30ce4bc0b7 (caif: Use RCU instead of spin-lock in caif_dev.c)
added a potential NULL dereference in case alloc_percpu() fails.

caif_device_alloc() can also use GFP_KERNEL instead of GFP_ATOMIC.

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
CC: Sjur Brændeland <sjur.brandeland@...ricsson.com>
---
 net/caif/caif_dev.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/net/caif/caif_dev.c b/net/caif/caif_dev.c
index 7c2fa0a..7f9ac07 100644
--- a/net/caif/caif_dev.c
+++ b/net/caif/caif_dev.c
@@ -93,10 +93,14 @@ static struct caif_device_entry *caif_device_alloc(struct net_device *dev)
 	caifdevs = caif_device_list(dev_net(dev));
 	BUG_ON(!caifdevs);
 
-	caifd = kzalloc(sizeof(*caifd), GFP_ATOMIC);
+	caifd = kzalloc(sizeof(*caifd), GFP_KERNEL);
 	if (!caifd)
 		return NULL;
 	caifd->pcpu_refcnt = alloc_percpu(int);
+	if (!caifd->pcpu_refcnt) {
+		kfree(caifd);
+		return NULL;
+	}
 	caifd->netdev = dev;
 	dev_hold(dev);
 	return caifd;


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