diff options
| -rw-r--r-- | src/3rdparty/harfbuzz/src/harfbuzz-thai.c | 9 | ||||
| -rw-r--r-- | tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp | 24 |
2 files changed, 30 insertions, 3 deletions
diff --git a/src/3rdparty/harfbuzz/src/harfbuzz-thai.c b/src/3rdparty/harfbuzz/src/harfbuzz-thai.c index bf6c35b19c..3c0ffe8358 100644 --- a/src/3rdparty/harfbuzz/src/harfbuzz-thai.c +++ b/src/3rdparty/harfbuzz/src/harfbuzz-thai.c @@ -263,8 +263,13 @@ static HB_Bool HB_ThaiConvertStringToGlyphIndices (HB_ShaperItem *item) // The only glyphs that should be passed to this function that cannot be mapped to // tis620 are the ones of type Inherited class. Pass these glyphs untouched. glyphString[slen++] = string[i]; - if (string[i] == 0x200D || string[i] == 0x200C) - item->attributes[slen-1].dontPrint = true; // Hide ZWJ and ZWNJ characters + if (string[i] == 0x200D || string[i] == 0x200C) { + // Check that we do not run out of bounds when setting item->attributes. If we do + // run out of bounds then this function will return false, the necessary amount of + // memory is reallocated, and this function will then be called again. + if (slen <= item->num_glyphs) + item->attributes[slen-1].dontPrint = true; // Hide ZWJ and ZWNJ characters + } } else { glyphString[slen++] = (HB_UChar16) thai_get_glyph_index (font_type, rglyphs[lgi]); } diff --git a/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp b/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp index a88e93c93e..d566f0a20d 100644 --- a/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp +++ b/tests/auto/gui/text/qtextscriptengine/tst_qtextscriptengine.cpp @@ -105,7 +105,7 @@ private slots: void thaiIsolatedSaraAm(); void thaiWithZWJ(); - + void thaiMultipleVowels(); private: bool haveTestFonts; }; @@ -1325,5 +1325,27 @@ void tst_QTextScriptEngine::thaiWithZWJ() QCOMPARE((bool)e->layoutData->glyphLayout.attributes[i].dontPrint, (i == 1 || i == 3)); } +void tst_QTextScriptEngine::thaiMultipleVowels() +{ + QString s(QString::fromUtf8("ส")); + for (int i = 0; i < 100; i++) + s += QChar(0x0E47); // Add lots of "VOWEL SIGN MAI TAI KHU N/S-T" stacked on top of the character + s += QChar(0x200D); // Now add a zero width joiner (which adds a circle which is hidden) + for (int i = 0; i < 100; i++) + s += QChar(0x0E47); //Add lots of "VOWEL SIGN MAI TAI KHU N/S-T" stacked on top of the ZWJ + + for (int i = 0; i < 10; i++) + s += s; //Repeat the string to make it more likely to crash if we have a buffer overflow + QTextLayout layout(s); + layout.beginLayout(); + layout.createLine(); + layout.endLayout(); + + QTextEngine *e = layout.engine(); + e->width(0, s.length()); //force itemize and shape + + // If we haven't crashed at this point, then the test has passed. +} + QTEST_MAIN(tst_QTextScriptEngine) #include "tst_qtextscriptengine.moc" |