Nouveau - Jun 2011 - [Bug 38196] New: Null pointer dereference in nouveau_gpuobj_channel_takedown

https://bugs.freedesktop.org/show_bug.cgi?id=38196

           Summary: Null pointer dereference in
                    nouveau_gpuobj_channel_takedown
           Product: Mesa
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: Drivers/DRI/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: rjgleits at bellsouth.net


The code for this procedure includes (line 878) assignment to a pointer of type
struct nv50_display_crtc. However nv50_display(dev) is null for earlier cards
(e.g., nv40). This causes a kernel oops if for example a program using mesa is
terminated.
I tried skipping the loop containing this line if nv50_display(dev) is null and
this worked on my 6800 Ultra. 

Best Wishes,

Bob Gleitsmann

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https://bugs.freedesktop.org/show_bug.cgi?id=38196

--- Comment #1 from Bob Gleitsmann <rjgleits at bellsouth.net> 2011-06-11
19:23:56 PDT ---
OK I don't know what product and component are to be used for bugs in kernel
drm. It isn't mesa, but should to to the dri-devel mailing list. Or whatever
you think.

Bob

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https://bugs.freedesktop.org/show_bug.cgi?id=38196

Pekka Paalanen <pq at iki.fi> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Product|Mesa                        |xorg
          Component|Drivers/DRI/nouveau         |Driver/nouveau

--- Comment #2 from Pekka Paalanen <pq at iki.fi> 2011-06-12 01:17:03 PDT
---
Since this bug apparently refers to nouveau_object.c in the kernel DRM, change
the product/component to as per http://nouveau.freedesktop.org/wiki/Bugs .

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Emil Velikov <emil.l.velikov at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Emil Velikov <emil.l.velikov at gmail.com> 2011-06-18
06:22:14 PDT ---
Thanks for reporting this Bob

The issue should be resolved by 23a3a221(drm/nouveau: fix null pointer deref on
pre-nv50 chipsets) in nouveau-git [1]


[1] http://cgit.freedesktop.org/nouveau/linux-2.6/

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