[PATCH] Don't potentially dereference NULL innet/dcb/dcbnl.c:dcbnl_getapp()

[Jesper Juhl]

nla_nest_start() may return NULL. If it does then we'll blow up in 
nla_nest_end() when we dereference the pointer.

Signed-off-by: Jesper Juhl <jj@xxxxxxxxxxxxx>
---
 dcbnl.c |    3 +++
 1 file changed, 3 insertions(+)

  only compile tested.

diff --git a/net/dcb/dcbnl.c b/net/dcb/dcbnl.c
index 6b03f56..13cdc30 100644
--- a/net/dcb/dcbnl.c
+++ b/net/dcb/dcbnl.c
@@ -626,6 +626,9 @@ static int dcbnl_getapp(struct net_device *netdev, struct nlattr **tb,
 	dcb->cmd = DCB_CMD_GAPP;
 
 	app_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_APP);
+	if (!app_nest)
+		goto out_cancel;
+
 	ret = nla_put_u8(dcbnl_skb, DCB_APP_ATTR_IDTYPE, idtype);
 	if (ret)
 		goto out_cancel;
-- 
Jesper Juhl <jj@xxxxxxxxxxxxx>            http://www.chaosbits.net/
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