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

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Date:   Wed, 11 Mar 2020 17:15:51 +0100
From:   Christoph Hellwig <hch@....de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Christoph Hellwig <hch@....de>, 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 05:14:23PM +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>