glx: Get GLX_SCREEN first in __glXQueryContextInfo()
And lookup the GLX screen for the context. Otherwise we'll end up
jumping through a NULL-pointer once we try to look up the visual
or config for the shared context.
https://bugs.freedesktop.org/show_bug.cgi?id=14245
diff --git a/src/glx/glxcmds.c b/src/glx/glxcmds.c
index 6063cf0..34fbecf 100644
--- a/src/glx/glxcmds.c
+++ b/src/glx/glxcmds.c
@@ -1766,6 +1766,15 @@
unsigned i;
_XRead(dpy, (char *) propList, nPropListBytes);
+
+ /* Look up screen first so we can look up visuals/fbconfigs later */
+ pProp = propList;
+ for (i = 0; i < numValues; i++, pProp += 2)
+ if (pProp[0] == GLX_SCREEN) {
+ ctx->screen = pProp[1];
+ ctx->psc = GetGLXScreenConfigs(dpy, ctx->screen);
+ }
+
pProp = propList;
for (i = 0; i < numValues; i++) {
switch (*pProp++) {
@@ -1776,9 +1785,6 @@
ctx->mode =
_gl_context_modes_find_visual(ctx->psc->visuals, *pProp++);
break;
- case GLX_SCREEN:
- ctx->screen = *pProp++;
- break;
case GLX_FBCONFIG_ID:
ctx->mode =
_gl_context_modes_find_fbconfig(ctx->psc->configs,
@@ -1787,6 +1793,7 @@
case GLX_RENDER_TYPE:
ctx->renderType = *pProp++;
break;
+ case GLX_SCREEN:
default:
pProp++;
continue;