linux-kernel - [PATCH] ext4: fix NULL pointer dereference in print_daily_error

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Date:	Wed, 15 Sep 2010 09:35:18 +0300
From:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
To:	Ted Ts'o <tytso@....edu>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	Jan Kara <jack@...e.cz>, Eric Sandeen <sandeen@...hat.com>,
	Christoph Hellwig <hch@....de>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ext4: fix NULL pointer dereference in
 print_daily_error_info

Fix NULL pointer dereference in print_daily_error_info, when   
called on unmounted fs (EXT4_SB(sb) returns NULL), by removing error 
reporting timer in ext4_put_super.

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>

---

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 2614774..751997d 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -719,6 +719,7 @@ static void ext4_put_super(struct super_block *sb)
 			ext4_abort(sb, "Couldn't clean up the journal");
 	}
 
+	del_timer(&sbi->s_err_report);
 	ext4_release_system_zone(sb);
 	ext4_mb_release(sb);
 	ext4_ext_release(sb);


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