linux-kernel - Re: [PATCH] drm/radeon/r100.c: check for invalid family

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Message-ID: <21d7e9971001061947k16ef1367k3c331a8849ce0109@mail.gmail.com>
Date:	Thu, 7 Jan 2010 13:47:07 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Darren Jenkins <darrenrjenkins@...il.com>
Cc:	David Airlie <airlied@...ux.ie>,
	dri-devel mailing list <dri-devel@...ts.sourceforge.net>,
	Kernel Janitors <kernel-janitors@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon/r100.c: check for invalid family

On Wed, Dec 30, 2009 at 11:24 AM, Darren Jenkins
<darrenrjenkins@...il.com> wrote:
> If there is an invalid family the fw_name is NULL and causes an
> NULL pointer dereference.
> This just adds a check for something unexpected.

NAK.

This can't happen, only gpus with those families set can call this function,
so we can't get in here without the correct family, and if we did it would be
due to developer error, so oopsing is very appropriate.

Dave.

>
> Coverity CID: 13251
>
> Signed-off-by: Darren Jenkins <darrenrjenkins@...il.com>
>
> diff --git drivers/gpu/drm/radeon/r100.c drivers/gpu/drm/radeon/r100.c
> index 7172746..e4b9770 100644
> --- drivers/gpu/drm/radeon/r100.c
> +++ drivers/gpu/drm/radeon/r100.c
> @@ -584,6 +584,8 @@ static int r100_cp_init_microcode(struct radeon_device *rdev)
>                   (rdev->family == CHIP_RV570)) {
>                DRM_INFO("Loading R500 Microcode\n");
>                fw_name = FIRMWARE_R520;
> +       } else {
> +               return -EINVAL;
>        }
>
>        err = request_firmware(&rdev->me_fw, fw_name, &pdev->dev);
>
>
> --
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