linux-kernel - Re: [PATCH] sound/isa/wavefront: copy userspace array safely

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Date:   Fri, 03 Nov 2023 15:04:42 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Philipp Stanner <pstanner@...hat.com>
Cc:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH] sound/isa/wavefront: copy userspace array safely

On Fri, 03 Nov 2023 14:58:22 +0100,
Takashi Iwai wrote:
> 
> On Thu, 02 Nov 2023 20:03:10 +0100,
> Philipp Stanner wrote:
> > 
> > wavefront_fx.c utilizes memdup_user() to copy a userspace array. This
> > does not check for an overflow.
> 
> There is a check above the memdup_user() call; it's at most 512
> bytes.
> 
> > Use the new wrapper memdup_array_user() to copy the array more safely.
> > 
> > Suggested-by: Dave Airlie <airlied@...hat.com>
> > Signed-off-by: Philipp Stanner <pstanner@...hat.com>
> 
> Although the check is already present, it's still better to use the
> new helper, so I applied the patch now.

... and the helper is available only on Linus tree for now, so I
postpone after 6.7-rc1 release, so that we can have a solid base.


Takashi