Avoid buffer overrun in QMacPixmapData resizing

Shouldn't use size bigger than the original (source) pixels buffer
or the new one (just allocated).

Task-number: QTBUG-18547
Reviewed-by: aavit

1 files changed, 1 insertions, 1 deletions

diff --git a/src/gui/image/qpixmap_mac.cpp b/src/gui/image/qpixmap_mac.cpp
index aac159e..6872cfa 100644
--- a/src/gui/image/qpixmap_mac.cpp
+++ b/src/gui/image/qpixmap_mac.cpp
@@ -637,7 +637,7 @@ void QMacPixmapData::macCreatePixels()
     }
 
     if (pixels)
-        memcpy(base_pixels, pixels, pixelsSize);
+        memcpy(base_pixels, pixels, qMin(pixelsSize, (uint) numBytes));
     pixels = base_pixels;
     pixelsSize = numBytes;
 }