btrfs: Drop inode if inode root is NULL

There is a path where btrfs_drop_inode() is called with its inode's root is NULL: In btrfs_new_inode(), when btrfs_set_inode_index() fails, iput() is called. We should handle this case before taking look at the root->root_item. Signed-off-by: Naohiro Aota <[email protected]> Reviewed-by: Miao Xie <[email protected]> Signed-off-by: Josef Bacik <[email protected]> Signed-off-by: Chris Mason <[email protected]>
kishon · Jun 8, 2013 · 6379ef9 · 6379ef9
1 parent 7b5ff90
commit 6379ef9
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
@@ -8011,6 +8011,9 @@ int btrfs_drop_inode(struct inode *inode)
 {
 	struct btrfs_root *root = BTRFS_I(inode)->root;
 
+	if (root == NULL)
+		return 1;
+
 	/* the snap/subvol tree is on deleting */
 	if (btrfs_root_refs(&root->root_item) == 0 &&
 	    root != root->fs_info->tree_root)