Btrfs: btrfs_read_fs_root_no_name() returns ERR_PTRs

btrfs_read_fs_root_no_name() returns ERR_PTRs on error so I added a
check for that.  It's not clear to me if it can also return NULL
pointers or not so I left the original NULL pointer check as is.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 73895baf6e07383a628e2c912f33a6cb17a8c4f8..34f7c375567e38eef3f83843baf0bf2272282008 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1985,6 +1985,10 @@ struct btrfs_root *open_ctree(struct super_block *sb,
        fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location);
        if (!fs_info->fs_root)
                goto fail_trans_kthread;
+       if (IS_ERR(fs_info->fs_root)) {
+               err = PTR_ERR(fs_info->fs_root);
+               goto fail_trans_kthread;
+       }
 
        if (!(sb->s_flags & MS_RDONLY)) {
                down_read(&fs_info->cleanup_work_sem);