netdev - Re: [PATCH v3] 3c59x: avoid panic in boomerang_start

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Message-ID: <20140907204359.GA16055@localhost.localdomain>
Date:	Sun, 7 Sep 2014 16:43:59 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, klassert@...hematik.tu-chemnitz.de
Subject: Re: [PATCH v3] 3c59x: avoid panic in boomerang_start_xmit when
 finding page address:

On Fri, Sep 05, 2014 at 05:24:26PM -0700, David Miller wrote:
> From: Neil Horman <nhorman@...driver.com>
> Date: Thu,  4 Sep 2014 06:13:38 -0400
> 
> > This bug was reported on a very old kernel (RHEL6, 2.6.32-491.el6):
>  ...
> > But the problem seems to still exist upstream.  It seems on 32 bit kernels
> > page_address() can reutrn a NULL value in some circumstances, and the
> > pci_map_single api isn't prepared to handle that (on this system it results in a
> > bogus pointer deference in nommu_map_page.
> > 
> > The fix is pretty easy, if we convert the 3c59x driver to use the more
> > convieient skb_frag_dma_map api we don't need to find the virtual address of the
> > page at all, and page gets mapped to the hardware properly.  Verified to fix the
> > problem as described by the reporter.
> > 
> > Applies to the net tree
> > 
> > Change Notes:
> > 
> > v2) Converted PCI_DMA_TODEVICE to DMA_TO_DEVICE.  Thanks Dave!
> > 
> > v3) Actually Run git commit after making changes to v2 :)
> > 
> > Signed-off-by: Neil Horman <nhorman@...driver.com>
> 
> Applied, thanks Neil.
> 
Thanks Dave!
Neil

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