Btrfs: add tree block level sanity check
With a users corrupted fs I was getting weird behavior and panics and it turns
out it was because one of his tree blocks had a bogus header level. So add this
to the sanity checks in the endio handler for tree blocks. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index bb6cdbd..c7d8fb0 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -613,6 +613,12 @@
goto err;
}
found_level = btrfs_header_level(eb);
+ if (found_level >= BTRFS_MAX_LEVEL) {
+ btrfs_info(root->fs_info, "bad tree block level %d\n",
+ (int)btrfs_header_level(eb));
+ ret = -EIO;
+ goto err;
+ }
btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb),
eb, found_level);
