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btrfs: replace ASSERT with proper error handling in stripe lookup fallback

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After falling back to the previous item in btrfs_delete_raid_extent(),
the code uses ASSERT(found_start <= start) to verify the found extent
actually precedes our target range. If the B-tree state is unexpected
(e.g. no overlapping extent exists), this triggers a kernel BUG/panic
in debug builds, or silently continues with wrong data otherwise.

Replace the ASSERT with a proper bounds check that returns -ENOENT if
the found extent does not actually overlap with the start position.

Signed-off-by: robbieko <robbieko@synology.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
robbieko 2026-04-13 14:52:35 +08:00 committed by David Sterba
parent 1871ae78ff
commit 653361585d
1 changed files with 4 additions and 1 deletions
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5
fs/btrfs/raid-stripe-tree.c
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@ -154,7 +154,10 @@ int btrfs_delete_raid_extent(struct btrfs_trans_handle *trans, u64 start, u64 le
btrfs_item_key_to_cpu(leaf, &key, slot);
found_start = key.objectid;
found_end = found_start + key.offset;
ASSERT(found_start <= start);
if (found_start > start || found_end <= start) {
ret = -ENOENT;
break;
}
}
if (key.type != BTRFS_RAID_STRIPE_KEY)