From: Zhang Yi <yi.zhang@huawei.com>
Date: Fri, 23 Apr 2021 12:35:07 +0000 (+0800)
Subject: ext4: correct error label in ext4_rename()
X-Git-Tag: v4.4.268~11
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b60a272ffb6a129f2e45fbf08e7c1acd18195167;p=thirdparty%2Fkernel%2Fstable.git

ext4: correct error label in ext4_rename()

The backport of upstream patch 5dccdc5a1916 ("ext4: do not iput inode
under running transaction in ext4_rename()") introduced a regression on
the stable kernels 4.14 and older. One of the end_rename error label was
forgetting to change to release_bh, which may trigger below bug.

 ------------[ cut here ]------------
 kernel BUG at /home/zhangyi/hulk-4.4/fs/ext4/ext4_jbd2.c:30!
 ...
 Call Trace:
  [<ffffffff8b4207b2>] ext4_rename+0x9e2/0x10c0
  [<ffffffff8b331324>] ? unlazy_walk+0x124/0x2a0
  [<ffffffff8b420eb5>] ext4_rename2+0x25/0x60
  [<ffffffff8b335104>] vfs_rename+0x3a4/0xed0
  [<ffffffff8b33a7ad>] SYSC_renameat2+0x57d/0x7f0
  [<ffffffff8b33c119>] SyS_renameat+0x19/0x30
  [<ffffffff8bc57bb8>] entry_SYSCALL_64_fastpath+0x18/0x78
 ...
 ---[ end trace 75346ce7c76b9f06 ]---

Fixes: 2fc8ce56985d ("ext4: do not iput inode under running transaction in ext4_rename()")
Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index f22fcb3936841..8cd2a7e1eef17 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -3561,7 +3561,7 @@ static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
 	    !ext4_is_child_context_consistent_with_parent(new.dir,
 							  old.inode)) {
 		retval = -EXDEV;
-		goto end_rename;
+		goto release_bh;
 	}
 
 	new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,