From: Naohiro Aota <naota@elisp.net>
Date: Thu, 6 Jun 2013 09:56:34 +0000 (+0000)
Subject: btrfs: Drop inode if inode root is NULL
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=6379ef9fb2482a92b5fe09f927d6ce1f989c0c6d;p=openwrt%2Fstaging%2Fblogic.git

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 <naota@elisp.net>
Reviewed-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
---

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 23c596cd1b98..c931a4dbd031 100644
--- 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)