[Bug 216338] New: Null Pointer Dereference in rockchip_drm_vop2.c

[bugzilla-daemon at kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216338

            Bug ID: 216338
           Summary: Null Pointer Dereference in rockchip_drm_vop2.c
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.19.0
          Hardware: ARM
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: macromorgan at hotmail.com
        Regression: No

When you use more than 1 video port (VP0 and VP1, for instance) on a Rockchip
RK3566 with the VOP2 driver, the driver issues a null pointer dereference when
it gets to the drm_crtc_init_with_planes function here:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/rockchip/rockchip_drm_vop2.c?h=v5.19#n2333

This appears to be because the function above it assigns primary planes to all
active video ports, but since it has special logic for the RK3566 it only ends
up with 1 primary plane to assign to a video port. When it encounters a second
video port it assigns it nothing, and then triggers a null pointer dereference
when it gets to the drm_crtc_init_with_planes function because plane is null.

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