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Don't potentially dereference NULL in net/dcb/dcbnl.c:dcbnl_getapp()
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@chaosbits.net> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -626,6 +626,9 @@ static int dcbnl_getapp(struct net_device *netdev, struct nlattr **tb,
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dcb->cmd = DCB_CMD_GAPP;
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app_nest = nla_nest_start(dcbnl_skb, DCB_ATTR_APP);
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if (!app_nest)
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goto out_cancel;
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ret = nla_put_u8(dcbnl_skb, DCB_APP_ATTR_IDTYPE, idtype);
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if (ret)
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goto out_cancel;
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