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

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Message-ID: <20200311161423.GA3941932@kroah.com>
Date:   Wed, 11 Mar 2020 17:14:23 +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 05:07:10PM +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:

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>