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lockd: Fix invalid lockowner cast after vfs_test_lock
[ Upstream commit cd2d644 ] After calling vfs_test_lock() the pointer to a conflicting lock can be returned, and that lock is not guarunteed to be owned by nlm. In that case, we cannot cast it to struct nlm_lockowner. Instead return the pid of that conflicting lock. Fixes: 646d73e ("lockd: Show pid of lockd for remote locks") Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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