btrfs: check block group lookup in remove_range_from_remap_tree()

Add a check in remove_range_from_remap_tree() after we call
btrfs_lookup_block_group(), to check if it is NULL. This shouldn't
happen, but if it does we at least get an error rather than a segfault.

Reported-by: Chris Mason <[email protected]>
Link: https://lore.kernel.org/linux-btrfs/[email protected]/
Fixes: 979e1dc ("btrfs: handle deletions from remapped block group")
Reviewed-by: Filipe Manana <[email protected]>
Signed-off-by: Mark Harmstone <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: maharmstone

fs/btrfs/relocation.c

@@ -5985,6 +5985,9 @@ static int remove_range_from_remap_tree(struct btrfs_trans_handle *trans,
 		struct btrfs_block_group *dest_bg;
 
 		dest_bg = btrfs_lookup_block_group(fs_info, new_addr);
+		if (unlikely(!dest_bg))
+			return -EUCLEAN;
+
 		adjust_block_group_remap_bytes(trans, dest_bg, -overlap_length);
 		btrfs_put_block_group(dest_bg);
 		ret = btrfs_add_to_free_space_tree(trans,