From: Josef Bacik <josef@toxicpanda.com>
Date: Fri, 5 Nov 2021 20:45:34 +0000 (-0400)
Subject: btrfs: remove BUG_ON() in find_parent_nodes()
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=623c65bc733683baf5dd7c66fa0593d59965e84f;p=linux-block.git

btrfs: remove BUG_ON() in find_parent_nodes()

[ Upstream commit fcba0120edf88328524a4878d1d6f4ad39f2ec81 ]

We search for an extent entry with .offset = -1, which shouldn't be a
thing, but corruption happens.  Add an ASSERT() for the developers,
return -EUCLEAN for mortals.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 6e447bdaf9ec..8b471579e26e 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1213,7 +1213,12 @@ again:
 	ret = btrfs_search_slot(trans, fs_info->extent_root, &key, path, 0, 0);
 	if (ret < 0)
 		goto out;
-	BUG_ON(ret == 0);
+	if (ret == 0) {
+		/* This shouldn't happen, indicates a bug or fs corruption. */
+		ASSERT(ret != 0);
+		ret = -EUCLEAN;
+		goto out;
+	}
 
 #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
 	if (trans && likely(trans->type != __TRANS_DUMMY) &&