glx: avoid possible NULLptr deref, fix #16884
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@ -148,8 +148,10 @@ void
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__glXContextDestroy(__GLXcontext *context)
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{
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if (!context->isDirect) {
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__glXUnrefDrawable(context->drawPriv);
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__glXUnrefDrawable(context->readPriv);
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if (context->drawPriv)
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__glXUnrefDrawable(context->drawPriv);
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if (context->readPriv)
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__glXUnrefDrawable(context->readPriv);
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}
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__glXFlushContextCache();
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}
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@ -621,8 +623,10 @@ DoMakeCurrent(__GLXclientState *cl,
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}
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__glXFlushContextCache();
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if (!prevglxc->isDirect) {
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__glXUnrefDrawable(prevglxc->drawPriv);
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__glXUnrefDrawable(prevglxc->readPriv);
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if (prevglxc->drawPriv)
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__glXUnrefDrawable(prevglxc->drawPriv);
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if (prevglxc->readPriv)
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__glXUnrefDrawable(prevglxc->readPriv);
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}
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}
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