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btrfs: handle invalid extent item reference found in find_first_extent_item()

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The find_first_extent_item() helper looks up an extent item by a key,
allowing to do an inexact search when key->offset is -1.  It's never
expected to find such item, as it would break the allowed range of a
extent item offset.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2024-01-24 22:49:02 +01:00
parent 11dcc86eba
commit f626a0f5b8
1 changed files with 8 additions and 1 deletions
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9
fs/btrfs/scrub.c
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@ -1390,8 +1390,15 @@ static int find_first_extent_item(struct btrfs_root *extent_root,
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
return ret;
if (ret == 0) {
/*
* Key with offset -1 found, there would have to exist an extent
* item with such offset, but this is out of the valid range.
*/
btrfs_release_path(path);
return -EUCLEAN;
}
ASSERT(ret > 0);
/*
* Here we intentionally pass 0 as @min_objectid, as there could be
* an extent item starting before @search_start.