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[vendor] fixed out of bounds memory access on negative pointer offsets

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This commit is contained in:
Geoffrey McRae 2017-11-03 00:27:22 +11:00
parent ffd2fc1824
commit dfa2a5809a
1 changed files with 2 additions and 2 deletions
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4
vendor/DXGICapture/DXGIManager.cpp vendored
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@ -562,9 +562,9 @@ void DXGIManager::DrawMousePointer(BYTE* pDesktopBits, RECT rcDesktop, RECT rcDe
// alpha blend the cursor // alpha blend the cursor
const int maxX = min(shapeInfo.Width , dwDesktopWidth - PtrX); const int maxX = min(shapeInfo.Width , dwDesktopWidth - PtrX);
const int maxY = min(shapeInfo.Height, dwDesktopHeight - PtrY); const int maxY = min(shapeInfo.Height, dwDesktopHeight - PtrY);
for(int y = 0; y < maxY; ++y) for(int y = abs(min(0, PtrY)); y < maxY; ++y)
{ {
for (int x = 0; x < maxX; ++x) for (int x = abs(min(0, PtrX)); x < maxX; ++x)
{ {
BYTE *srcPix = &PtrBuf[y * shapeInfo.Pitch + x * 4]; BYTE *srcPix = &PtrBuf[y * shapeInfo.Pitch + x * 4];
BYTE *dstPix = &pDesktopBits[((PtrY + y) * dwDesktopWidth * 4) + (PtrX + x) * 4]; BYTE *dstPix = &pDesktopBits[((PtrY + y) * dwDesktopWidth * 4) + (PtrX + x) * 4];