[PATCH 6.6.y] btrfs: handle errors from btrfs_dec_ref() properly

[jianqi.ren.cn]

From: Josef Bacik <josef@xxxxxxxxxxxxxx>

[ Upstream commit 5eb178f373b4f16f3b42d55ff88fc94dd95b93b1 ]

In walk_up_proc() we BUG_ON(ret) from btrfs_dec_ref().  This is
incorrect, we have proper error handling here, return the error.

Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Jianqi Ren <jianqi.ren.cn@xxxxxxxxxxxxx>
Signed-off-by: He Zhe <zhe.he@xxxxxxxxxxxxx>
---
Verified the build test
---
 fs/btrfs/extent-tree.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 021cf468274b..af03a1c6ba76 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5540,7 +5540,10 @@ static noinline int walk_up_proc(struct btrfs_trans_handle *trans,
 				ret = btrfs_dec_ref(trans, root, eb, 1);
 			else
 				ret = btrfs_dec_ref(trans, root, eb, 0);
-			BUG_ON(ret); /* -ENOMEM */
+			if (ret) {
+				btrfs_abort_transaction(trans, ret);
+				return ret;
+			}
 			if (is_fstree(root->root_key.objectid)) {
 				ret = btrfs_qgroup_trace_leaf_items(trans, eb);
 				if (ret) {
-- 
2.34.1