[Bug 102574] glDrawBuffer crashes in case of surfaceless context

[Bug 102574] glDrawBuffer crashes in case of surfaceless context

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https://bugs.freedesktop.org/show_bug.cgi?id=102574

            Bug ID: 102574
           Summary: glDrawBuffer crashes in case of surfaceless context
           Product: Mesa
           Version: 17.1
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/i915
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: v.vogelhuber@digitalendoscopy.de
        QA Contact: dri-devel@lists.freedesktop.org

I've created a surfaceless OpenGL context using the EGL_KHR_surfaceless_context
extension together with eglGetPlatformDisplay/EGL_PLATFORM_GBM_MESA.
In this scenario there seem to be no valid default framebuffer which is Ok, as
I'm normally only render to FBOs with textures bound. Due to an error on my
side I called glDrawBuffer with GL_FRONT_LEFT while no FBO was bound.

This result in a crash in intel_buffers.c because in intelDrawBuffer()
dri2InvalidateDrawable is called with a null pointer which is
not checked in dri2InvalidateDrawable() or anywhere before.

While the root cause for triggering the error is on my side,
I think it may be better to raise an error instead of crashing.
So I propose to add a check to brw->driContext->driDrawablePriv
within intelDrawBuffer. Probably if the driDrawablePriv is nullptr
one should not call intel_prepare_render either. 

Mesa 17.1 with Kernel 4.9.6 on Intel Apollo Lake GPU

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[Bug 102574] glDrawBuffer crashes in case of surfaceless context

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https://bugs.freedesktop.org/show_bug.cgi?id=102574

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

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

--- Comment #1 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/778.

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