linux-kernel - Re: Nokia N900: refcount_t underflow, use after free

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Message-ID: <20180524110533.GA20599@amd>
Date:   Thu, 24 May 2018 13:05:33 +0200
From:   Pavel Machek <pavel@....cz>
To:     Suman Anna <s-anna@...com>
Cc:     Robin Murphy <robin.murphy@....com>, ivo.g.dimitrov.75@...il.com,
        khilman@...nel.org, Tony Lindgren <tony@...mide.com>,
        aaro.koskinen@....fi, kernel list <linux-kernel@...r.kernel.org>,
        sre@...nel.org, martijn@...xit.nl,
        Filip Matijević <filip.matijevic.pz@...il.com>,
        abcloriens@...il.com, sakari.ailus@...ux.intel.com,
        pali.rohar@...il.com, clayton@...ftyguy.net,
        linux-omap@...r.kernel.org, patrikbachan@...il.com,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        serge@...lyn.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>
Subject: Re: Nokia N900: refcount_t underflow, use after free

Hi!

> >>
> >> OK, see if the following fixes the issue for you, only build tested.
> > 
> > Word-wrapped, so I applied by hand. And yes, the oops at boot is
> > gone. Thanks!
> 
> Sorry about that, have to check my mail settings. Anyway will post the
> patch again, glad that it fixed your issue.

Any news here? AFAICT the bug creeped into v4.17-rcX in the
meantime...

								Pavel

> regards
> Suman
> 
> > 
> > (Camera still does not work in -next... kills system. Oh well. Lets
> > debug that some other day.)
> > 
> >> 8< ---------------------
> >> >From bac9a48fb646dc51f2030d676a0dbe3298c3b134 Mon Sep 17 00:00:00 2001
> >> From: Suman Anna <s-anna@...com>
> >> Date: Fri, 9 Mar 2018 16:39:59 -0600
> >> Subject: [PATCH] media: omap3isp: fix unbalanced dma_iommu_mapping
> >>
> >> The OMAP3 ISP driver manages its MMU mappings through the IOMMU-aware
> >> ARM DMA backend. The current code creates a dma_iommu_mapping and
> >> attaches this to the ISP device, but never detaches the mapping in
> >> either the probe failure paths or the driver remove path resulting
> >> in an unbalanced mapping refcount and a memory leak. Fix this properly.
> >>
> >> Reported-by: Pavel Machek <pavel@....cz>
> >> Signed-off-by: Suman Anna <s-anna@...com>
> > 
> > Tested-by: Pavel Machek <pavel@....cz>
> > 									Pavel
> > 

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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