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btrfs: ref-verify: handle damaged extent root tree

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Syzbot hits a problem with enabled ref-verify, ignorebadroots and a
fuzzed/damaged extent tree. There's no fallback option like in other
places that can deal with it so disable the whole ref-verify as it is
just a debugging feature.

Reported-by: syzbot+9c3e0cdfbfe351b0bc0e@syzkaller.appspotmail.com
Link: https://lore.kernel.org/all/0000000000001b6052062139be1c@google.com/
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2025-09-15 08:37:47 +02:00
parent 96fa515e70
commit ed4e6b5d64
1 changed files with 8 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

9
fs/btrfs/ref-verify.c
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@ -980,11 +980,18 @@ int btrfs_build_ref_tree(struct btrfs_fs_info *fs_info)
if (!btrfs_test_opt(fs_info, REF_VERIFY))
return 0;
extent_root = btrfs_extent_root(fs_info, 0);
/* If the extent tree is damaged we cannot ignore it (IGNOREBADROOTS). */
if (IS_ERR(extent_root)) {
btrfs_warn(fs_info, "ref-verify: extent tree not available, disabling");
btrfs_clear_opt(fs_info->mount_opt, REF_VERIFY);
return 0;
}
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
extent_root = btrfs_extent_root(fs_info, 0);
eb = btrfs_read_lock_root_node(extent_root);
level = btrfs_header_level(eb);
path->nodes[level] = eb;