diff options
Diffstat (limited to 'dev-qt/qtcore/files/qtcore-5.12.3-CVE-2019-18281.patch')
-rw-r--r-- | dev-qt/qtcore/files/qtcore-5.12.3-CVE-2019-18281.patch | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/dev-qt/qtcore/files/qtcore-5.12.3-CVE-2019-18281.patch b/dev-qt/qtcore/files/qtcore-5.12.3-CVE-2019-18281.patch new file mode 100644 index 000000000000..055794b51964 --- /dev/null +++ b/dev-qt/qtcore/files/qtcore-5.12.3-CVE-2019-18281.patch @@ -0,0 +1,98 @@ +From 1232205e32464d90e871f39eb1e14fcf9b78a163 Mon Sep 17 00:00:00 2001 +From: Rainer Keller <Rainer.Keller@qt.io> +Date: Tue, 27 Aug 2019 14:44:48 +0200 +Subject: [PATCH] Fix crash when text contains too many directional chars + +In case a text to be layouted contains more than 128 directional characters +it causes the application to crash + +The function initScriptAnalysisAndIsolatePairs() collects information of +RTL/LTR chaaracters into vector "isolatePairs". The size of the vector is +capped to 128. Later the function generateDirectionalRuns() iterates +the text again and tries to access items from the previously capped vector +above the upper bound. + +Task-number: QTBUG-77819 +Change-Id: Ibb7bf12c12b1db22f43ff46236518da3fdeed26a +Reviewed-by: Simon Hausmann <simon.hausmann@qt.io> +--- + src/gui/text/qtextengine.cpp | 15 +++++++-------- + tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp | 17 +++++++++++++++++ + 2 files changed, 24 insertions(+), 8 deletions(-) + +diff --git a/src/gui/text/qtextengine.cpp b/src/gui/text/qtextengine.cpp +index 2da13289bfd..a7834587b1e 100644 +--- a/src/gui/text/qtextengine.cpp ++++ b/src/gui/text/qtextengine.cpp +@@ -399,6 +399,7 @@ struct QBidiAlgorithm { + analysis[i].bidiDirection = (level & 1) ? QChar::DirR : QChar::DirL; + runHasContent = true; + lastRunWithContent = -1; ++ ++isolatePairPosition; + } + int runBeforeIsolate = runs.size(); + ushort newLevel = isRtl ? ((stack.top().level + 1) | 1) : ((stack.top().level + 2) & ~1); +@@ -440,21 +441,19 @@ struct QBidiAlgorithm { + doEmbed(true, true, false); + break; + case QChar::DirLRI: +- Q_ASSERT(isolatePairs.at(isolatePairPosition).start == i); + doEmbed(false, false, true); +- ++isolatePairPosition; + break; + case QChar::DirRLI: +- Q_ASSERT(isolatePairs.at(isolatePairPosition).start == i); + doEmbed(true, false, true); +- ++isolatePairPosition; + break; + case QChar::DirFSI: { +- const auto &pair = isolatePairs.at(isolatePairPosition); +- Q_ASSERT(pair.start == i); +- bool isRtl = QStringView(text + pair.start + 1, pair.end - pair.start - 1).isRightToLeft(); ++ bool isRtl = false; ++ if (isolatePairPosition < isolatePairs.size()) { ++ const auto &pair = isolatePairs.at(isolatePairPosition); ++ Q_ASSERT(pair.start == i); ++ isRtl = QStringView(text + pair.start + 1, pair.end - pair.start - 1).isRightToLeft(); ++ } + doEmbed(isRtl, false, true); +- ++isolatePairPosition; + break; + } + +diff --git a/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp b/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp +index 9c477589f93..f0a32c2ed40 100644 +--- a/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp ++++ b/tests/auto/gui/text/qtextlayout/tst_qtextlayout.cpp +@@ -138,6 +138,7 @@ private slots: + void noModificationOfInputString(); + void superscriptCrash_qtbug53911(); + void showLineAndParagraphSeparatorsCrash(); ++ void tooManyDirectionalCharctersCrash_qtbug77819(); + + private: + QFont testFont; +@@ -2309,5 +2310,21 @@ void tst_QTextLayout::nbspWithFormat() + QCOMPARE(layout.lineAt(1).textLength(), s2.length() + 1 + s3.length()); + } + ++void tst_QTextLayout::tooManyDirectionalCharctersCrash_qtbug77819() ++{ ++ QString data; ++ data += QString::fromUtf8("\xe2\x81\xa8"); // U+2068 FSI character ++ data += QString::fromUtf8("\xe2\x81\xa7"); // U+2067 RLI character ++ ++ // duplicating the text ++ for (int i = 0; i < 10; i++) ++ data += data; ++ ++ // Nothing to test. It must not crash in beginLayout(). ++ QTextLayout tl(data); ++ tl.beginLayout(); ++ tl.endLayout(); ++} ++ + QTEST_MAIN(tst_QTextLayout) + #include "tst_qtextlayout.moc" +-- +2.16.3 |