[PATCH 3/3] glx: Initialize glx even if there are currently no screens attached

[Jeremy Huddleston Sequoia]

Failure to do so causes an overvlow in glxClientCallback

Application Specific Information:
X.Org X Server 1.18.99.1 Build Date: 20160911
=================================================================
==52118==ERROR: AddressSanitizer: SEGV on unknown address 0x000102b27b80 (pc 0x000103433245 bp 0x70000de67c20 sp 0x70000de67c00 T6)
    #0 0x103433244 in __asan::asan_free(void*, __sanitizer::BufferedStackTrace*, __asan::AllocType) (libclang_rt.asan_osx_dynamic.dylib+0x3244)
    #1 0x10347aeee in wrap_free (libclang_rt.asan_osx_dynamic.dylib+0x4aeee)
    #2 0x102e6a5ed in glxClientCallback glxext.c:301
    #3 0x102b672a3 in _CallCallbacks dixutils.c:737
    #4 0x102b2f0c6 in CallCallbacks callback.h:83
    #5 0x102b5c15a in NextAvailableClient dispatch.c:3562
    #6 0x102d7060c in AllocNewConnection connection.c:777
    #7 0x102d71355 in EstablishNewConnections connection.c:863
    #8 0x102b662f0 in ProcessWorkQueue dixutils.c:523
    #9 0x102d52a7f in WaitForSomething WaitFor.c:175
    #10 0x102b204f6 in Dispatch dispatch.c:411
    #11 0x102b61e01 in dix_main main.c:301
    #12 0x10254c42a in server_thread quartzStartup.c:66
    #13 0x7fffc5f16aaa in _pthread_body (libsystem_pthread.dylib+0x3aaa)
    #14 0x7fffc5f169f6 in _pthread_start (libsystem_pthread.dylib+0x39f6)
    #15 0x7fffc5f161fc in thread_start (libsystem_pthread.dylib+0x31fc)

Signed-off-by: Jeremy Huddleston Sequoia <jeremyhu at apple.com>
---
 glx/glxext.c | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/glx/glxext.c b/glx/glxext.c
index d595a05..d216c9d 100644
--- a/glx/glxext.c
+++ b/glx/glxext.c
@@ -319,23 +319,6 @@ GlxPushProvider(__GLXprovider * provider)
     __glXProviderStack = provider;
 }
 
-static Bool
-checkScreenVisuals(void)
-{
-    int i, j;
-
-    for (i = 0; i < screenInfo.numScreens; i++) {
-        ScreenPtr screen = screenInfo.screens[i];
-        for (j = 0; j < screen->numVisuals; j++) {
-            if (screen->visuals[j].class == TrueColor ||
-                screen->visuals[j].class == DirectColor)
-                return True;
-        }
-    }
-
-    return False;
-}
-
 static void
 GetGLXDrawableBytes(void *value, XID id, ResourceSizePtr size)
 {
@@ -371,10 +354,6 @@ GlxExtensionInit(void)
         *stack = &__glXDRISWRastProvider;
     }
 
-    /* Mesa requires at least one True/DirectColor visual */
-    if (!checkScreenVisuals())
-        return;
-
     __glXContextRes = CreateNewResourceType((DeleteType) ContextGone,
                                             "GLXContext");
     __glXDrawableRes = CreateNewResourceType((DeleteType) DrawableGone,
-- 
2.9.3