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Commit 046f264f authored by Yan, Zheng's avatar Yan, Zheng Committed by Chris Mason
Browse files

Btrfs: Fix null dereference in relocation.c 



Fix a potential null dereference in relocation.c

Signed-off-by: default avatarYan Zheng <zheng.yan@oracle.com>
Acked-by: default avatarDan Carpenter <error27@gmail.com>
Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 058a457e

fs/btrfs/relocation.c

+4 −3
Original line number Diff line number Diff line
@@ -784,16 +784,17 @@ struct backref_node *build_backref_tree(struct reloc_control *rc, 
				struct btrfs_extent_ref_v0 *ref0;

				ref0 = btrfs_item_ptr(eb, path1->slots[0],

						struct btrfs_extent_ref_v0);

				root = find_tree_root(rc, eb, ref0);

				if (!root->ref_cows)

					cur->cowonly = 1;

				if (key.objectid == key.offset) {

					root = find_tree_root(rc, eb, ref0);

					if (root && !should_ignore_root(root))

						cur->root = root;

					else

						list_add(&cur->list, &useless);

					break;

				}

				if (is_cowonly_root(btrfs_ref_root_v0(eb,

								      ref0)))

					cur->cowonly = 1;

			}

#else

		BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY);