linux-kernel - Re: [PATCH 05/16] fs: fix kernel

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Date:   Wed, 30 Aug 2017 16:37:04 +0100
From:   Al Viro <viro@...IV.linux.org.uk>
To:     Christoph Hellwig <hch@....de>
Cc:     arve@...roid.com, riandrews@...roid.com,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/16] fs: fix kernel_read prototype

On Wed, Aug 30, 2017 at 04:59:56PM +0200, Christoph Hellwig wrote:
> Use proper ssize_t and size_t types for the return value and count
> argument,  move the offset last and make it an in/out argument like
> all other read/write helpers.

Might be better to switch the third argument to void * at the same time
and lose those casts.

>  			if (p)
>  				memcpy(p + offset, buf, n);
> -
> -			offset += n;

Almost certainly broken - in effect, you've taken the update of offset
several lines prior, so that memcpy() is getting the wrong first argument.
The same needs to be watched out for in other similar places.