[Nouveau] [Bug 28626] New: Oops: kernel NULL pointer dereference in nouveau_connector_get_modes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28626

           Summary: Oops: kernel NULL pointer dereference in
                    nouveau_connector_get_modes
           Product: xorg
           Version: git
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: albrt at gmx.net
         QAContact: xorg-team at lists.x.org


Created an attachment (id=36380)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=36380)
dmesg with the oops

Booting with nouveau/linux-2.6 from git results in a kernel oops:
[    3.817681] BUG: unable to handle kernel NULL pointer dereference at
0000000000000060
[    3.818051] IP: [<ffffffffa01128b0>] nouveau_connector_get_modes+0x180/0x410
[nouveau]
Please see attached dmesg for the full oops.

System environment:
-- chipset: intel PM965 + G86 [GeForce 8400M GT]
-- system architecture: 64-bit
-- xf86-video-nouveau: git, db98ad2363 (20 June)
-- xserver: 1.7.5
-- libdrm: 2.4.20
-- kernel: 2.6.34 + nouveau/linux from git: 48f4092e87
-- Machine: laptop, Sony Vaio FZ21-M
-- Display connector: LVDS (1280x800) + HDMI (1680x1050)

Reverting commit "drm/nouveau: move LVDS detection back to connector detect()
time" solved the oops.
Further debugging showed nv_encoder was NULL in nouveau_connector_get_modes.
Attached patch solves the problem for me.

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