From: Josef Bacik josef@toxicpanda.com
[ 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@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 --- fs/btrfs/backref.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c index f2c2ac3343bac..58dc96d7ecafa 100644 --- a/fs/btrfs/backref.c +++ b/fs/btrfs/backref.c @@ -1315,10 +1315,18 @@ 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;