linux-kernel - [PATCH 5.4 34/88] btrfs: replace the BUG_ON in btrfs_del_root

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Message-Id: <20211213092934.418604006@linuxfoundation.org>
Date:   Mon, 13 Dec 2021 10:30:04 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Josef Bacik <josef@...icpanda.com>,
        Qu Wenruo <wqu@...e.com>, David Sterba <dsterba@...e.com>
Subject: [PATCH 5.4 34/88] btrfs: replace the BUG_ON in btrfs_del_root_ref with proper error handling

From: Qu Wenruo <wqu@...e.com>

commit 8289ed9f93bef2762f9184e136d994734b16d997 upstream.

I hit the BUG_ON() with generic/475 test case, and to my surprise, all
callers of btrfs_del_root_ref() are already aborting transaction, thus
there is not need for such BUG_ON(), just go to @out label and caller
will properly handle the error.

CC: stable@...r.kernel.org # 5.4+
Reviewed-by: Josef Bacik <josef@...icpanda.com>
Signed-off-by: Qu Wenruo <wqu@...e.com>
Reviewed-by: David Sterba <dsterba@...e.com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/btrfs/root-tree.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/btrfs/root-tree.c
+++ b/fs/btrfs/root-tree.c
@@ -371,7 +371,8 @@ int btrfs_del_root_ref(struct btrfs_tran
 	key.offset = ref_id;
 again:
 	ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1);
-	BUG_ON(ret < 0);
+	if (ret < 0)
+		goto out;
 	if (ret == 0) {
 		leaf = path->nodes[0];
 		ref = btrfs_item_ptr(leaf, path->slots[0],