This is a note to let you know that I've just added the patch titled btrfs: remove BUG_ON(!eie) in find_parent_nodes to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: btrfs-remove-bug_on-eie-in-find_parent_nodes.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit f3b7c277e9d3b9f8febc50f84312076252dc516c Author: Josef Bacik <josef@xxxxxxxxxxxxxx> Date: Fri Nov 5 16:45:35 2021 -0400 btrfs: remove BUG_ON(!eie) in find_parent_nodes [ Upstream commit 9f05c09d6baef789726346397438cca4ec43c3ee ] If we're looking for leafs that point to a data extent we want to record the extent items that point at our bytenr. At this point we have the reference and we know for a fact that this leaf should have a reference to our bytenr. However if there's some sort of corruption we may not find any references to our leaf, and thus could end up with eie == NULL. Replace this BUG_ON() with an ASSERT() and then return -EUCLEAN for the mortals. Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx> Reviewed-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: David Sterba <dsterba@xxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index 8b471579e26e1..baff31a147e7d 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -1366,10 +1366,18 @@ static int find_parent_nodes(struct btrfs_trans_handle *trans, goto out; if (!ret && extent_item_pos) { /* - * we've recorded that parent, so we must extend - * its inode list here + * We've recorded that parent, so we must extend + * its inode list here. + * + * However if there was corruption we may not + * have found an eie, return an error in this + * case. */ - BUG_ON(!eie); + ASSERT(eie); + if (!eie) { + ret = -EUCLEAN; + goto out; + } while (eie->next) eie = eie->next; eie->next = ref->inode_list;