linux-ext4 - Re: [PATCH] : make sure the buffer head members are zeroed out before using them.

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Message-ID: <ea11fea30901250753j6db5158dj9082d57aa9469685@mail.gmail.com>
Date:	Sun, 25 Jan 2009 21:23:22 +0530
From:	Manish Katiyar <mkatiyar@...il.com>
To:	ext4 <linux-ext4@...r.kernel.org>, "Theodore Ts'o" <tytso@....edu>,
	cmm@...ibm.com
Cc:	mkatiyar@...il.com
Subject: Re: [PATCH] : make sure the buffer head members are zeroed out before 
	using them.

On Tue, Jan 20, 2009 at 10:36 PM, Manish Katiyar <mkatiyar@...il.com> wrote:
> ext2_quota_read doesn't bzeroes tmp_bh before calling ext2_get_block()
> where we access the b_size of it. Since it is a local variable it
> might contain some garbage. Make sure it is filled with zero before
> passing.

Hi Ted/mingming,

Any feedback on this ??

Thanks -
Manish

>
> Signed-off-by : Manish Katiyar <mkatiyar@...il.com>
> ---
>  fs/ext2/super.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/ext2/super.c b/fs/ext2/super.c
> index da8bdea..d10aa44 100644
> --- a/fs/ext2/super.c
> +++ b/fs/ext2/super.c
> @@ -1327,7 +1327,7 @@ static ssize_t ext2_quota_read(struct
> super_block *sb, int type, char *data,
>                tocopy = sb->s_blocksize - offset < toread ?
>                                sb->s_blocksize - offset : toread;
>
> -               tmp_bh.b_state = 0;
> +               memset(&tmp_bh, 0, sizeof(struct buffer_head));
>                err = ext2_get_block(inode, blk, &tmp_bh, 0);
>                if (err < 0)
>                        return err;
> @@ -1366,7 +1366,7 @@ static ssize_t ext2_quota_write(struct
> super_block *sb, int type,
>                tocopy = sb->s_blocksize - offset < towrite ?
>                                sb->s_blocksize - offset : towrite;
>
> -               tmp_bh.b_state = 0;
> +               memset(&tmp_bh, 0, sizeof(struct buffer_head));
>                err = ext2_get_block(inode, blk, &tmp_bh, 1);
>                if (err < 0)
>                        goto out;
> --
> 1.5.4.3
>
>
> Thanks -
> Manish
>
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