linux-kernel - Re: [PATCH 183/190] Revert "media: isif: fix a NULL pointer dereference bug"

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Date:   Tue, 27 Apr 2021 15:16:54 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Wenwen Wang <wang6495@....edu>, Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Subject: Re: [PATCH 183/190] Revert "media: isif: fix a NULL pointer
 dereference bug"

On Wed, Apr 21, 2021 at 03:00:58PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit a26ac6c1bed951b2066cc4b2257facd919e35c0b.
> 
> Commits from @umn.edu addresses have been found to be submitted in "bad
> faith" to try to test the kernel community's ability to review "known
> malicious" changes.  The result of these submissions can be found in a
> paper published at the 42nd IEEE Symposium on Security and Privacy
> entitled, "Open Source Insecurity: Stealthily Introducing
> Vulnerabilities via Hypocrite Commits" written by Qiushi Wu (University
> of Minnesota) and Kangjie Lu (University of Minnesota).
> 
> Because of this, all submissions from this group must be reverted from
> the kernel tree and will need to be re-reviewed again to determine if
> they actually are a valid fix.  Until that work is complete, remove this
> change to ensure that no problems are being introduced into the
> codebase.
> 
> Cc: Wenwen Wang <wang6495@....edu>
> Cc: Hans Verkuil <hverkuil@...all.nl>
> Cc: Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/media/platform/davinci/isif.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/davinci/isif.c b/drivers/media/platform/davinci/isif.c
> index c53cecd072b1..5355a14c090b 100644
> --- a/drivers/media/platform/davinci/isif.c
> +++ b/drivers/media/platform/davinci/isif.c
> @@ -1086,8 +1086,7 @@ static int isif_probe(struct platform_device *pdev)
>  
>  	while (i >= 0) {
>  		res = platform_get_resource(pdev, IORESOURCE_MEM, i);
> -		if (res)
> -			release_mem_region(res->start, resource_size(res));
> +		release_mem_region(res->start, resource_size(res));
>  		i--;
>  	}
>  	vpfe_unregister_ccdc_device(&isif_hw_dev);
> -- 
> 2.31.1
> 

This looks correct, dropping it.

greg k-h