linux-kernel - Re: [PATCH 119/190] Revert "tty: mxs-auart: fix a potential NULL pointer dereference"

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Message-ID: <1af822a8-2a1b-9110-9832-ba0fe237a1c1@kernel.org>
Date:   Thu, 22 Apr 2021 07:03:55 +0200
From:   Jiri Slaby <jirislaby@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org
Cc:     Kangjie Lu <kjlu@....edu>, stable <stable@...r.kernel.org>
Subject: Re: [PATCH 119/190] Revert "tty: mxs-auart: fix a potential NULL
 pointer dereference"

On 21. 04. 21, 14:59, Greg Kroah-Hartman wrote:
> This reverts commit 6734330654dac550f12e932996b868c6d0dcb421.
> 
> 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: Kangjie Lu <kjlu@....edu>
> Cc: stable <stable@...r.kernel.org>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>   drivers/tty/serial/mxs-auart.c | 4 ----
>   1 file changed, 4 deletions(-)
> 
> diff --git a/drivers/tty/serial/mxs-auart.c b/drivers/tty/serial/mxs-auart.c
> index f414d6acad69..edad6ebbdfd5 100644
> --- a/drivers/tty/serial/mxs-auart.c
> +++ b/drivers/tty/serial/mxs-auart.c
> @@ -1644,10 +1644,6 @@ static int mxs_auart_probe(struct platform_device *pdev)
>   
>   	s->port.mapbase = r->start;
>   	s->port.membase = ioremap(r->start, resource_size(r));
> -	if (!s->port.membase) {
> -		ret = -ENOMEM;
> -		goto out_disable_clks;
> -	}

I don't think this needs to be reverted -- the original fix is correct.

>   	s->port.ops = &mxs_auart_ops;
>   	s->port.iotype = UPIO_MEM;
>   	s->port.fifosize = MXS_AUART_FIFO_SIZE;
> 


-- 
js
suse labs