[NETFILTER] ctnetlink: check if protoinfo is present
This fixes an oops triggered from userspace. If we don't pass information about the private protocol info, the reference to attr will be NULL. This is likely to happen in update messages. Signed-off-by: NPablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: NHarald Welte <laforge@netfilter.org> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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