5.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Fedor Pchelkin <pchelkin@xxxxxxxxx>
commit f03e274a8b29d1d1c1bbd7f764766cb5ca537ab7 upstream.
As clearing REF_VERIFY mount option indicates there were some errors in a
ref-verify process, a ref cache is not relevant anymore and should be
freed.
btrfs_free_ref_cache() requires REF_VERIFY option being set so call
it just before clearing the mount option.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Reported-by: syzbot+be14ed7728594dc8bd42@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: fd708b81d972 ("Btrfs: add a extent ref verify tool")
CC: stable@xxxxxxxxxxxxxxx # 5.4+
Closes: https://lore.kernel.org/lkml/000000000000e5a65c05ee832054@xxxxxxxxxx/
Reported-by: syzbot+c563a3c79927971f950f@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lore.kernel.org/lkml/0000000000007fe09705fdc6086c@xxxxxxxxxx/
Reviewed-by: Anand Jain <anand.jain@xxxxxxxxxx>
Signed-off-by: Fedor Pchelkin <pchelkin@xxxxxxxxx>
Reviewed-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: David Sterba <dsterba@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/btrfs/ref-verify.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/fs/btrfs/ref-verify.c
+++ b/fs/btrfs/ref-verify.c
@@ -888,8 +888,10 @@ int btrfs_ref_tree_mod(struct btrfs_fs_i
out_unlock:
spin_unlock(&fs_info->ref_verify_lock);
out:
- if (ret)
+ if (ret) {
+ btrfs_free_ref_cache(fs_info);
btrfs_clear_opt(fs_info->mount_opt, REF_VERIFY);
+ }
return ret;
}
@@ -1018,8 +1020,8 @@ int btrfs_build_ref_tree(struct btrfs_fs
}
}
if (ret) {
- btrfs_clear_opt(fs_info->mount_opt, REF_VERIFY);
btrfs_free_ref_cache(fs_info);
+ btrfs_clear_opt(fs_info->mount_opt, REF_VERIFY);
}
btrfs_free_path(path);
return ret;
