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

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The check_committed_ref() 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.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2024-01-24 15:37:59 +01:00
parent 7411055db5
commit a4259b6c19
1 changed files with 8 additions and 1 deletions
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9
fs/btrfs/extent-tree.c
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@ -2396,7 +2396,14 @@ static noinline int check_committed_ref(struct btrfs_root *root,
ret = btrfs_search_slot(NULL, extent_root, &key, path, 0, 0);
if (ret < 0)
goto out;
BUG_ON(ret == 0); /* Corruption */
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.
*/
ret = -EUCLEAN;
goto out;
}
ret = -ENOENT;
if (path->slots[0] == 0)