linux-kernel - Re: [PATCH] fbdev/core: Avoid uninitialized read in aperture_remove_conflicting_pci

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Message-ID: <8a228fca-993b-154e-edaa-8d6044449631@suse.de>
Date:   Thu, 27 Oct 2022 09:56:48 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Michał Mirosław <mirq-linux@...e.qmqm.pl>
Cc:     Javier Martinez Canillas <javierm@...hat.com>,
        Helge Deller <deller@....de>, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fbdev/core: Avoid uninitialized read in
 aperture_remove_conflicting_pci_device()

Hi

thanks for the patch. Added to drm-misc-fixes.

Best regards
Thomas

Am 27.10.22 um 02:06 schrieb Michał Mirosław:
> Return on error directly from the BAR-iterating loop instead of
> break+return.
> 
> This is actually a cosmetic fix, since it would be highly unusual to
> have this called for a PCI device without any memory BARs.
> 
> Fixes: 9d69ef183815 ("fbdev/core: Remove remove_conflicting_pci_framebuffers()")
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> ---
>   drivers/video/aperture.c | 5 +----
>   1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/drivers/video/aperture.c b/drivers/video/aperture.c
> index 9e6bcc03a1a4..41e77de1ea82 100644
> --- a/drivers/video/aperture.c
> +++ b/drivers/video/aperture.c
> @@ -340,12 +340,9 @@ int aperture_remove_conflicting_pci_devices(struct pci_dev *pdev, const char *na
>   		size = pci_resource_len(pdev, bar);
>   		ret = aperture_remove_conflicting_devices(base, size, primary, name);
>   		if (ret)
> -			break;
> +			return ret;
>   	}
>   
> -	if (ret)
> -		return ret;
> -
>   	/*
>   	 * WARNING: Apparently we must kick fbdev drivers before vgacon,
>   	 * otherwise the vga fbdev driver falls over.

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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