linux-kernel - Re: [PATCH] xhci: fix null-pointer dereference when destroying half-built segment rings

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Message-Id: <95F2AD07-450E-422C-AB0B-9DFC4734CA1C@google.com>
Date:	Thu, 1 Nov 2012 13:28:46 -0700
From:	Julius Werner <jwerner@...gle.com>
To:	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Cc:	Andy Shevchenko <andy.shevchenko@...il.com>,
	Julius Werner <jwerner@...omium.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Vincent Palatin <vpalatin@...omium.org>
Subject: Re: [PATCH] xhci: fix null-pointer dereference when destroying half-built segment rings

>> Is it just
>> for (prev = *first; prev; prev = prev->next)
>>    xhci_segment_free(xhci, prev);
>> 
>> ?
> 
> Yeah, that seems cleaner.
> 
> Sarah Sharp

I can submit it that way if you want, but I would advise against it. This way you access the prev pointer after it has been freed already… that's probably not a problem in the current kernel, but it depends on how the underlying memory is managed and is generally just not a good idea in my opinion.--
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