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diff -up qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp.me qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp
--- qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp.me 2019-03-22 10:22:16.213800109 +0100
+++ qt-everywhere-opensource-src-4.8.7/src/gui/image/qppmhandler.cpp 2019-03-22 10:22:40.721890281 +0100
@@ -108,7 +108,7 @@ static bool read_pbm_header(QIODevice *d
else
mcc = read_pbm_int(device); // get max color component
- if (w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0)
+ if (w <= 0 || w > 32767 || h <= 0 || h > 32767 || mcc <= 0 || mcc > 0xffff)
return false; // weird P.M image
return true;
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