linux-kernel - Re: [PATCH 099/190] Revert "omapfb: Fix potential NULL pointer dereference in kmalloc"

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Date:   Tue, 27 Apr 2021 19:35:24 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Aditya Pakki <pakki001@....edu>, Kangjie Lu <kjlu@....edu>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH 099/190] Revert "omapfb: Fix potential NULL pointer
 dereference in kmalloc"

On Wed, Apr 21, 2021 at 02:59:34PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit 31fa6e2ae65feed0de10823c5d1eea21a93086c9.
> 
> 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: Aditya Pakki <pakki001@....edu>
> Cc: Kangjie Lu <kjlu@....edu>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c | 2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c b/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c
> index 0ae0cab252d3..05d87dcbdd8b 100644
> --- a/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c
> +++ b/drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c
> @@ -100,8 +100,6 @@ static void __init omapdss_omapify_node(struct device_node *node)
>  
>  	new_len = prop->length + strlen(prefix) * num_strs;
>  	new_compat = kmalloc(new_len, GFP_KERNEL);
> -	if (!new_compat)
> -		return;
>  
>  	omapdss_prefix_strcpy(new_compat, new_len, prop->value, prop->length);
>  
> -- 
> 2.31.1
> 

Original looks correct, I'll drop this revert.

greg k-h