From f22249cef54b101e83e00bb4f7ccde8cdb4c09ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Henrik=20Rydg=C3=A5rd?= <hrydgard@gmail.com>
Date: Wed, 20 Dec 2023 18:31:49 +0100
Subject: [PATCH] Reject zero-vertex-count draws.

I thought all the code was safe against it, but it isn't.
---
 GPU/Common/DrawEngineCommon.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/GPU/Common/DrawEngineCommon.cpp b/GPU/Common/DrawEngineCommon.cpp
index 83aaeb7164..fc0200d76d 100644
--- a/GPU/Common/DrawEngineCommon.cpp
+++ b/GPU/Common/DrawEngineCommon.cpp
@@ -910,6 +910,10 @@ bool DrawEngineCommon::SubmitPrim(const void *verts, const void *inds, GEPrimiti
 		if ((vertexCount < 2 && prim > 0) || (prim > GE_PRIM_LINE_STRIP && prim != GE_PRIM_RECTANGLES)) {
 			return false;
 		}
+		if (vertexCount <= 0) {
+			// Unfortunately we need to do this check somewhere since GetIndexBounds doesn't handle zero-length arrays.
+			return false;
+		}
 	}
 
 	bool applySkin = (vertTypeID & GE_VTYPE_WEIGHT_MASK) && decOptions_.applySkinInDecode;