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Date:	Sun, 16 Nov 2008 11:05:24 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	stable@...nel.org
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Li Zefan <lizf@...fujitsu.com>, "Theodore Ts'o" <tytso@....edu>
Subject: [FOR-STABLE 04/20] ext4: add missing unlock in ext4_check_descriptors() on error path

From: Li Zefan <lizf@...fujitsu.com>

If there group descriptors are corrupted we need unlock the block
group lock before returning from the function; else we will oops when
freeing a spinlock which is still being held.

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
Signed-off-by: "Theodore Ts'o" <tytso@....edu>
(cherry picked from commit 7ee1ec4ca30c6df8e989615cdaacb75f2af4fa6b)
---
 fs/ext4/super.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 062b7c5..f98f9bb 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -1626,8 +1626,10 @@ static int ext4_check_descriptors(struct super_block *sb)
 			       "Checksum for group %lu failed (%u!=%u)\n",
 			       i, le16_to_cpu(ext4_group_desc_csum(sbi, i,
 			       gdp)), le16_to_cpu(gdp->bg_checksum));
-			if (!(sb->s_flags & MS_RDONLY))
+			if (!(sb->s_flags & MS_RDONLY)) {
+				spin_unlock(sb_bgl_lock(sbi, i));
 				return 0;
+			}
 		}
 		spin_unlock(sb_bgl_lock(sbi, i));
 		if (!flexbg_flag)
-- 
1.6.0.4.8.g36f27.dirty

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