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btrfs: handle invalid root reference found in btrfs_init_root_free_objectid()

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The btrfs_init_root_free_objectid() looks up a root 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 root id.

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 2024-01-23 23:34:57 +01:00
parent 9dcb6ed9ce
commit a67242907b
1 changed files with 8 additions and 1 deletions
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9
fs/btrfs/disk-io.c
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@ -4927,7 +4927,14 @@ int btrfs_init_root_free_objectid(struct btrfs_root *root)
ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
if (ret < 0)
goto error;
BUG_ON(ret == 0); /* Corruption */
if (ret == 0) {
/*
* Key with offset -1 found, there would have to exist a root
* with such id, but this is out of valid range.
*/
ret = -EUCLEAN;
goto error;
}
if (path->slots[0] > 0) {
slot = path->slots[0] - 1;
l = path->nodes[0];