linux-kernel - Re: [PATCH] ext3: fix ext34_fill_super group description initialization

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Message-ID: <20070813092512.GB25226@dnb.sw.ru>
Date:	Mon, 13 Aug 2007 13:25:13 +0400
From:	Dmitry Monakhov <dmonakhov@...ru>
To:	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org,
	devel@...nvz.org
Subject: Re: [PATCH] ext3: fix ext34_fill_super group description
	initialization

On 13:09 Mon 13 Aug     , Dmitry Monakhov wrote:
> ->s_group_desc have to be zero filled because if sb_read() failed
> we jump to following error path.
> failed_mount2:
> 	for (i = 0; i < db_count; i++)
> 		brelse(sbi->s_group_desc[i]);<< Bad things may happen here
OOPs i'm sorry. I've lost db_count changing after sb_read() error,
so error path is ok, and this patch is not needed.
> 
> Signed-off-by: Dmitry Monakhov <dmonakhov@...nvz.org>
> ---
>  fs/ext3/super.c |    2 +-
>  fs/ext4/super.c |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext3/super.c b/fs/ext3/super.c
> index f8ac18f..208738e 100644
> --- a/fs/ext3/super.c
> +++ b/fs/ext3/super.c
> @@ -1718,7 +1718,7 @@ static int ext3_fill_super (struct super_block *sb, void *data, int silent)
>  				       / EXT3_BLOCKS_PER_GROUP(sb)) + 1;
>  	db_count = (sbi->s_groups_count + EXT3_DESC_PER_BLOCK(sb) - 1) /
>  		   EXT3_DESC_PER_BLOCK(sb);
> -	sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
> +	sbi->s_group_desc = kzalloc(db_count * sizeof (struct buffer_head *),
>  				    GFP_KERNEL);
>  	if (sbi->s_group_desc == NULL) {
>  		printk (KERN_ERR "EXT3-fs: not enough memory\n");
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 8f1d2f6..fefffc0 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -1830,7 +1830,7 @@ static int ext4_fill_super (struct super_block *sb, void *data, int silent)
>  	sbi->s_groups_count = blocks_count;
>  	db_count = (sbi->s_groups_count + EXT4_DESC_PER_BLOCK(sb) - 1) /
>  		   EXT4_DESC_PER_BLOCK(sb);
> -	sbi->s_group_desc = kmalloc(db_count * sizeof (struct buffer_head *),
> +	sbi->s_group_desc = kzalloc(db_count * sizeof (struct buffer_head *),
>  				    GFP_KERNEL);
>  	if (sbi->s_group_desc == NULL) {
>  		printk (KERN_ERR "EXT4-fs: not enough memory\n");
> -- 
> 1.5.2.2
> 
> 
> -
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