linux-kernel - Re: [v3.11][Regression] HID: hyperv: convert alloc+memcpy to memdup

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Message-ID: <alpine.LNX.2.00.1309241129370.18703@pobox.suse.cz>
Date:	Tue, 24 Sep 2013 11:29:57 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Joseph Salisbury <joseph.salisbury@...onical.com>
Cc:	Dan Carpenter <dan.carpenter@...cle.com>, thomas@...3r.de,
	list@...osl.org, Haiyang Zhang <haiyangz@...rosoft.com>,
	LKML <linux-kernel@...r.kernel.org>, open@...osl.org,
	HID CORE LAYER <linux-input@...r.kernel.org>,
	devel@...uxdriverproject.org
Subject: Re: [v3.11][Regression] HID: hyperv: convert alloc+memcpy to
 memdup

On Mon, 16 Sep 2013, Joseph Salisbury wrote:

> >> Can you explain a little further?  Mark commit a4a23f6 as bad?  An
> >> initial bisect already reported that was the first bad commit, so it
> >> can't be marked bad.  The oops on memcpy() happens after commit a4a23f6
> >> is reverted.  The oops on memcpy() did not happen before a4a23f6 was
> >> committed, so I assume this new oops was introduced by a change later.
> >>
> >> Right now I'm bisecting down the oops on memcpy() by updating the bisect
> >> with good or bad, depending if the test kernel hit the oops.  I then
> >> revert a4a23f6, so that revert is the HEAD of the tree each time before
> >> building the kernel again(As long as the commit spit out by bisect is
> >> after when a4a23f6 was introduced).
> > Yep.  Please continue bisecting the memcpy() oops.
> >
> > kmemdup() is just a kzalloc() followed by a memcpy().  When we split it
> > apart by reverting the patch then we would expect the oops to move to
> > the memcpy() part.  Somehow "desc" is a bogus pointer, but I don't
> > immediately see how that is possible.
> >
> > regards,
> > dan carpenter
> 
> Thanks for the details.  We'll continue the bisect and let you know how
> it goes.

Did this please yield any useful result?

Thanks,

-- 
Jiri Kosina
SUSE Labs
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