ceph: fix NULL pointer deref when debugging is enabled

Signed-off-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
mariux64 · May 7, 2019 · 40e7e2c · 40e7e2c
1 parent 428bb68
commit 40e7e2c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
@@ -928,7 +928,7 @@ ceph_direct_read_write(struct kiocb *iocb, struct iov_iter *iter,
 
 	dout("sync_direct_%s on file %p %lld~%u snapc %p seq %lld\n",
 	     (write ? "write" : "read"), file, pos, (unsigned)count,
-	     snapc, snapc->seq);
+	     snapc, snapc ? snapc->seq : 0);
 
 	ret = filemap_write_and_wait_range(inode->i_mapping,
 					   pos, pos + count - 1);