From 2054d9d68964452df71c2e7501b6901718742907 Mon Sep 17 00:00:00 2001
From: Sergey Lipskiy <gonetz@ngs.ru>
Date: Sat, 7 May 2016 23:20:10 +0600
Subject: [PATCH] Fix FrameBuffer::copyRdram(): fingerprint size must be not
 less than 4.

Fixed validity check for PD cloacking effect, #839
---
 src/FrameBuffer.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/FrameBuffer.cpp b/src/FrameBuffer.cpp
index 68670d1d..8fdaa0f3 100644
--- a/src/FrameBuffer.cpp
+++ b/src/FrameBuffer.cpp
@@ -335,7 +335,7 @@ void FrameBuffer::copyRdram()
 		// This is necessary for auxilary buffers: game can restore content of RDRAM when buffer is not needed anymore
 		// Thus content of RDRAM on moment of buffer creation will be the same as when buffer becomes obsolete.
 		// Validity check will see that the RDRAM is the same and thus the buffer is valid, which is false.
-		const u32 twoPercent = dataSize / 200;
+		const u32 twoPercent = max(4U, dataSize / 200);
 		u32 start = m_startAddress >> 2;
 		u32 * pData = (u32*)RDRAM;
 		for (u32 i = 0; i < twoPercent; ++i) {