btrfs: fix memory leaks in create_space_info() error paths

In create_space_info(), the 'space_info' object is allocated at the
beginning of the function. However, there are two error paths where the
function returns an error code without freeing the allocated memory:

1. When create_space_info_sub_group() fails in zoned mode.
2. When btrfs_sysfs_add_space_info_type() fails.

In both cases, 'space_info' has not yet been added to the
fs_info->space_info list, resulting in a memory leak. Fix this by
adding an error handling label to kfree(space_info) before returning.

Fixes: 2be12ef79fe9 ("btrfs: Separate space_info create/update")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Jiasheng Jiang <jiashengjiangcool@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/space-info.c b/fs/btrfs/space-info.c
index 6babbe333741d90a9de35e6b4ffd3d7eef604819..3f08e450f7961eece0634fa06b898dd9b49f1d0b 100644 (file)
--- a/fs/btrfs/space-info.c
+++ b/fs/btrfs/space-info.c
@@ -306,18 +306,22 @@ static int create_space_info(struct btrfs_fs_info *info, u64 flags)
                                                          0);
 
                if (ret)
-                       return ret;
+                       goto out_free;
        }
 
        ret = btrfs_sysfs_add_space_info_type(space_info);
        if (ret)
-               return ret;
+               goto out_free;
 
        list_add(&space_info->list, &info->space_info);
        if (flags & BTRFS_BLOCK_GROUP_DATA)
                info->data_sinfo = space_info;
 
        return ret;
+
+out_free:
+       kfree(space_info);
+       return ret;
 }
 
 int btrfs_init_space_info(struct btrfs_fs_info *fs_info)