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glx: Fix potential crashes in glXWait{GL,X}

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glxc->drawPriv will be NULL if the context is direct, or if it is
current but without a bound drawable. Mesa's libGL won't normally emit
protocol for direct contexts for these calls, but a malign client could
still crash the server.
This commit is contained in:
Adam Jackson
2019-05-14 12:39:23 -04:00
parent a0f738a673
commit 2aec5c3c81
1 changed files with 2 additions and 2 deletions
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4
glx/glxcmds.c
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@@ -765,7 +765,7 @@ __glXDisp_WaitGL(__GLXclientState * cl, GLbyte * pc)
glFinish();
}
if (glxc && glxc->drawPriv->waitGL)
if (glxc && glxc->drawPriv && glxc->drawPriv->waitGL)
(*glxc->drawPriv->waitGL) (glxc->drawPriv);
return Success;
@@ -789,7 +789,7 @@ __glXDisp_WaitX(__GLXclientState * cl, GLbyte * pc)
return error;
}
if (glxc && glxc->drawPriv->waitX)
if (glxc && glxc->drawPriv && glxc->drawPriv->waitX)
(*glxc->drawPriv->waitX) (glxc->drawPriv);
return Success;