Btrfs: fix use-after-free when dumping free space

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / fs / btrfs / inode-map.c

diff --git a/fs/btrfs/inode-map.c b/fs/btrfs/inode-map.c
index 767a605..07573dc 100644 (file)
--- a/fs/btrfs/inode-map.c
+++ b/fs/btrfs/inode-map.c
@@ -515,7 +515,7 @@ out:
        return ret;
 }
 
-static int btrfs_find_highest_objectid(struct btrfs_root *root, u64 *objectid)
+int btrfs_find_highest_objectid(struct btrfs_root *root, u64 *objectid)
 {
        struct btrfs_path *path;
        int ret;
@@ -555,13 +555,6 @@ int btrfs_find_free_objectid(struct btrfs_root *root, u64 *objectid)
        int ret;
        mutex_lock(&root->objectid_mutex);
 
-       if (unlikely(root->highest_objectid < BTRFS_FIRST_FREE_OBJECTID)) {
-               ret = btrfs_find_highest_objectid(root,
-                                                 &root->highest_objectid);
-               if (ret)
-                       goto out;
-       }
-
        if (unlikely(root->highest_objectid >= BTRFS_LAST_FREE_OBJECTID)) {
                ret = -ENOSPC;
                goto out;