[SRU][Focal][PATCH 1/2] btrfs: check return value of btrfs_commit_transaction in relocation

[Yuxuan Luo]

From: Josef Bacik <josef at toxicpanda.com>

There are a few places where we don't check the return value of
btrfs_commit_transaction in relocation.c.  Thankfully all these places
have straightforward error handling, so simply change all of the sites
at once.

Reviewed-by: Qu Wenruo <wqu at suse.com>
Signed-off-by: Josef Bacik <josef at toxicpanda.com>
Reviewed-by: David Sterba <dsterba at suse.com>
Signed-off-by: David Sterba <dsterba at suse.com>
(cherry picked from commit fb686c6824dd6294ca772b92424b8fba666e7d00)
CVE-2023-3111
Signed-off-by: Yuxuan Luo <yuxuan.luo at canonical.com>
---
 fs/btrfs/relocation.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c
index ba68b0b41dff3..c196863420571 100644
--- a/fs/btrfs/relocation.c
+++ b/fs/btrfs/relocation.c
@@ -2511,7 +2511,7 @@ int prepare_to_merge(struct reloc_control *rc, int err)
 	list_splice(&reloc_roots, &rc->reloc_roots);
 
 	if (!err)
-		btrfs_commit_transaction(trans);
+		err = btrfs_commit_transaction(trans);
 	else
 		btrfs_end_transaction(trans);
 	return err;
@@ -4102,8 +4102,7 @@ int prepare_to_relocate(struct reloc_control *rc)
 		 */
 		return PTR_ERR(trans);
 	}
-	btrfs_commit_transaction(trans);
-	return 0;
+	return btrfs_commit_transaction(trans);
 }
 
 static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
@@ -4263,7 +4262,9 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
 		err = PTR_ERR(trans);
 		goto out_free;
 	}
-	btrfs_commit_transaction(trans);
+	ret = btrfs_commit_transaction(trans);
+	if (ret && !err)
+		err = ret;
 out_free:
 	ret = clean_dirty_subvols(rc);
 	if (ret < 0 && !err)
-- 
2.34.1