segfault after commit GLX: Enable GLX 1.4 on DRI2

[Ian Romanick]

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Markus Amsler wrote:
> After
> 
> commit ad5c0d9efa47476ed5cf75c82265c73919e468b4
> Author: Ian Romanick <ian.d.romanick at intel.com>
> Date:   Tue Sep 29 16:43:43 2009 -0700
>     GLX: Enable GLX 1.4 on DRI2
> 
> I'm getting segfaults at server startup in glx/glxext.c:373:
> 
>         for (p = __glXProviderStack; p != NULL; p = p->next) {
>             __GLXscreen *glxScreen;
> 
>             glxScreen = p->screenProbe(pScreen);
>             if (glxScreen != NULL) {
>                 LogMessage(X_INFO,
>                            "GLX: Initialized %s GL provider for screen 
> %d\n",
>                            p->name, i);
>                 break;
>             }
> 
>             if (glxScreen->GLXminor < glxMinorVersion)
>                 glxMinorVersion = glxScreen->GLXminor;
>         }
> 
> 
> This code doesn't make sense because if glxScreen is NULL it runs 
> straight into an segfault with glxScreen->GLXminor

This should be fixed by Dave's patch.  Look for the message with the
subject "[PATCH] glx: fixup deref of null pointer when glx screen init
fails."
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