linux-kernel - Re: [PATCH 115/190] Revert "thunderbolt: Fix a missing check of kmemdup"

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Date:   Thu, 22 Apr 2021 14:30:12 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, Kangjie Lu <kjlu@....edu>
Subject: Re: [PATCH 115/190] Revert "thunderbolt: Fix a missing check of
 kmemdup"

On Wed, Apr 21, 2021 at 02:59:50PM +0200, Greg Kroah-Hartman wrote:
> This reverts commit e4dfdd5804cce1255f99c5dd033526a18135a616.
> 
> 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.

This one too is valid.

> Cc: Kangjie Lu <kjlu@....edu>
> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/thunderbolt/property.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/thunderbolt/property.c b/drivers/thunderbolt/property.c
> index 841314deb446..ee76449524a3 100644
> --- a/drivers/thunderbolt/property.c
> +++ b/drivers/thunderbolt/property.c
> @@ -176,10 +176,6 @@ static struct tb_property_dir *__tb_property_parse_dir(const u32 *block,
>  	} else {
>  		dir->uuid = kmemdup(&block[dir_offset], sizeof(*dir->uuid),
>  				    GFP_KERNEL);
> -		if (!dir->uuid) {
> -			tb_property_free_dir(dir);
> -			return NULL;
> -		}
>  		content_offset = dir_offset + 4;
>  		content_len = dir_len - 4; /* Length includes UUID */
>  	}
> -- 
> 2.31.1