For fuzzed image bko-156811-bad-parent-ref-qgroup-verify.raw, it cause
qgroup to report -ENOMEM.
But the fact is, such image is heavy damaged so there is not valid root
item for extent tree.
Normal extent tree key in root tree should be (EXTENT_TREE ROOT_ITEM 0),
while in that fuzzed image, we got (EXTENT_TREE EXXTENT_DATA SOME_NUMBER).
It's btrfs_find_last_root() that only checks the objectid, not caring
key type leads to such problem.
Fix by doing extra check on key type for such case.
Signed-off-by: Qu Wenruo <quwen...@cn.fujitsu.com>
---
root-tree.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/root-tree.c b/root-tree.c
index ab01a140..6b8f8c1c 100644
--- a/root-tree.c
+++ b/root-tree.c
@@ -51,7 +51,8 @@ int btrfs_find_last_root(struct btrfs_root *root, u64
objectid,
l = path->nodes[0];
slot = path->slots[0] - 1;
btrfs_item_key_to_cpu(l, &found_key, slot);
- if (found_key.objectid != objectid) {
+ if (found_key.type != BTRFS_ROOT_ITEM_KEY ||
+ found_key.objectid != objectid) {
ret = -ENOENT;
goto out;
}
--
2.12.2
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