linux-kernel - Re: [PATCH] Fix minixfs size check

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Date:	Tue, 15 May 2012 00:19:48 +0200
From:	Jan Kara <jack@...e.cz>
To:	Vladimir 'φ-coder/phcoder' Serbinenko 
	<phcoder@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] Fix minixfs size check

On Sun 13-05-12 15:48:55, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
> minixfs file size check is buggy and it doesn't allow creating a block which
> can't be fully filled
  Umm, I'm not really minix expert but who'd set s_max_size to something
which is not a multiple of block size? This looks rather artifical problem
to me...

								Honza
> 
> Signed-off-by: Vladimir Serbinenko <phcoder@...il.com>
> 
> diff --git a/fs/minix/itree_v1.c b/fs/minix/itree_v1.c
> index 282e15a..4f8f8b2 100644
> --- a/fs/minix/itree_v1.c
> +++ b/fs/minix/itree_v1.c
> @@ -29,7 +29,8 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
>  	if (block < 0) {
>  		printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
>  			block, bdevname(inode->i_sb->s_bdev, b));
> -	} else if (block >= (minix_sb(inode->i_sb)->s_max_size/BLOCK_SIZE)) {
> +	} else if ((u64) block * (u64) BLOCK_SIZE
> +		   >= minix_sb(inode->i_sb)->s_max_size) {
>  		if (printk_ratelimit())
>  			printk("MINIX-fs: block_to_path: "
>  			       "block %ld too big on dev %s\n",
> diff --git a/fs/minix/itree_v2.c b/fs/minix/itree_v2.c
> index 13487ad..4a9a19d 100644
> --- a/fs/minix/itree_v2.c
> +++ b/fs/minix/itree_v2.c
> @@ -32,7 +32,8 @@ static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
>  	if (block < 0) {
>  		printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
>  			block, bdevname(sb->s_bdev, b));
> -	} else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
> +	} else if ((u64) block * (u64) sb->s_blocksize
> +		   >= minix_sb(inode->i_sb)->s_max_size) {
>  		if (printk_ratelimit())
>  			printk("MINIX-fs: block_to_path: "
>  			       "block %ld too big on dev %s\n",
> 


-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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