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From:   Anders Larsen <al@alarsen.net>
To:     Tong Zhang <ztong0001@gmail.com>
Cc:     linux-kernel@vger.kernel.org
Subject: Re: [PATCH] qnx4: do not interpret -EIO as a correct address
Date:   Mon, 02 Nov 2020 10:12:15 +0100
Message-ID: <1966437.kWHqOGhHGQ@alarsen.net>
In-Reply-To: <20201023211604.159074-1-ztong0001@gmail.com>
References: <20201023211604.159074-1-ztong0001@gmail.com>
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On Friday, 2020-10-23 23:16 Tong Zhang wrote:
> qnx4_block_map() may return -EIO on funny qnx4 fs image, in this case do
> not interpret -EIO as a correct address
> 
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> ---
>  fs/qnx4/inode.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
> index e8da1cde87b9..d3a40c5b1a9a 100644
> --- a/fs/qnx4/inode.c
> +++ b/fs/qnx4/inode.c
> @@ -59,6 +59,8 @@ static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_h
>  	QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
>  
>  	phys = qnx4_block_map( inode, iblock );
> +	if (phys == -EIO)
> +		return -EIO;
>  	if ( phys ) {
>  		// logical block is before EOF
>  		map_bh(bh, inode->i_sb, phys);

The fix looks sane to me, but how about the two other callers of
qnx4_block_map(), are they not affected as well?

Cheers
Anders