Oct 17 2015

NFC: delete null dereference 

Author: Julia Lawall <Julia.Lawall@lip6.fr>

The exit label performs device_unlock(&dev->dev);, which will fail when dev
is NULL, and nfc_put_device(dev);, which is not useful when dev is NULL, so
just exit the function immediately.

Problem found using scripts/coccinelle/null/deref_null.cocci

Signed-off-by: Julia Lawall 
Signed-off-by: Samuel Ortiz 

---
 net/nfc/netlink.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)
 
diff --git a/net/nfc/netlink.c b/net/nfc/netlink.c
index 853172c..f040532 100644
--- a/net/nfc/netlink.c
+++ b/net/nfc/netlink.c
@@ -1109,10 +1109,8 @@ static int nfc_genl_llc_sdreq(struct sk_buff *skb, struct genl_info *info)
 	idx = nla_get_u32(info->attrs[NFC_ATTR_DEVICE_INDEX]);
 
 	dev = nfc_get_device(idx);
-	if (!dev) {
-		rc = -ENODEV;
-		goto exit;
-	}
+	if (!dev)
+		return -ENODEV;
 
 	device_lock(&dev->dev);

qlambert