linux-kernel - Re: [PATCH 7/7] Revert "serial: max310x: pass return value of spi_register

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Date:   Thu, 29 Apr 2021 16:12:07 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Kangjie Lu <kjlu@....edu>
Subject: Re: [PATCH 7/7] Revert "serial: max310x: pass return value of
 spi_register_driver"

On Thu, Apr 29, 2021 at 03:41:51PM +0200, Greg Kroah-Hartman wrote:
> On Thu, Apr 29, 2021 at 03:08:11PM +0200, Greg Kroah-Hartman wrote:
> > This reverts commit 51f689cc11333944c7a457f25ec75fcb41e99410.
> > 
> > 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 submitted to 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) but later
> > withdrawn.
> > 
> > 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>
> > Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > ---
> >  drivers/tty/serial/max310x.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
> > index 8534d6e45a1d..a3ba0e6520a1 100644
> > --- a/drivers/tty/serial/max310x.c
> > +++ b/drivers/tty/serial/max310x.c
> > @@ -1518,10 +1518,10 @@ static int __init max310x_uart_init(void)
> >  		return ret;
> >  
> >  #ifdef CONFIG_SPI_MASTER
> > -	ret = spi_register_driver(&max310x_spi_driver);
> > +	spi_register_driver(&max310x_spi_driver);
> >  #endif
> >  
> > -	return ret;
> > +	return 0;
> >  }
> >  module_init(max310x_uart_init);
> >  
> > -- 
> > 2.31.1
> > 
> 
> This is incorrect because if spi_register_driver fails, the uart needs
> to be properly unregistered before the module is unloaded automatically,
> causing a crash.
> 
> I'll keep the revert and fix this up properly.

Argh, I already reviewed this one, sigh...

greg k-h