linux-kernel - Re: [PATCH] device core: fix dma_mask handling in platform_device_register

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Message-ID: <20200311171802.GA3952198@kroah.com>
Date:   Wed, 11 Mar 2020 18:18:02 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Christoph Hellwig <hch@....de>
Cc:     torvalds@...ux-foundation.org, aros@....com,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Subject: Re: [PATCH] device core: fix dma_mask handling in
 platform_device_register_full

On Wed, Mar 11, 2020 at 05:15:51PM +0100, Christoph Hellwig wrote:
> On Wed, Mar 11, 2020 at 05:14:23PM +0100, Greg KH wrote:
> > On Wed, Mar 11, 2020 at 05:07:10PM +0100, Christoph Hellwig wrote:
> > > Ever since the generic platform device code started allocating DMA masks
> > > itself the code to allocate and leak a private DMA mask in
> > > platform_device_register_full has been superflous.  More so the fact that
> > > it unconditionally frees the DMA mask allocation in the failure path
> > > can lead to slab corruption if the function fails later on for a device
> > > where it didn't allocate the mask.  Just remove the offending code.
> > > 
> > > Fixes: cdfee5623290 ("driver core: initialize a default DMA mask for platform device")
> > > Reported-by: Artem S. Tashkinov <aros@....com>
> > > Tested-by: Artem S. Tashkinov <aros@....com>
> > 
> > No s-o-b from you?  :(
> > 
> > I can take this, or Linus, you can take this now if you want to as well:
> 
> Sorry, here it is:
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Is this still needed with the patch that Linus just committed to his
tree?

thanks,

greg k-h