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author | Orgad Shaneh <orgad.shaneh@audiocodes.com> | 2015-02-03 09:10:37 +0200 |
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committer | Nikolai Kosjar <nikolai.kosjar@theqtcompany.com> | 2015-02-03 12:03:29 +0000 |
commit | 75a943ef57da0179e742c7d396fb28f909e1add1 (patch) | |
tree | 9788b80781437639f94f888b6e0fb6197403c0d8 | |
parent | d7e5d41494597ceaf7422f4b6a918d024c31caad (diff) | |
download | qt-creator-75a943ef57da0179e742c7d396fb28f909e1add1.tar.gz |
C++: Fix crash when #if[def] nesting is deeper than 512 levels
Change-Id: I5e86da3a36514545834f554470b147ad8be43344
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>
-rw-r--r-- | src/libs/cplusplus/pp-engine.cpp | 27 | ||||
-rw-r--r-- | tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp | 18 |
2 files changed, 40 insertions, 5 deletions
diff --git a/src/libs/cplusplus/pp-engine.cpp b/src/libs/cplusplus/pp-engine.cpp index c0e6e3e827..9cafea26f2 100644 --- a/src/libs/cplusplus/pp-engine.cpp +++ b/src/libs/cplusplus/pp-engine.cpp @@ -140,6 +140,12 @@ static bool isQtReservedWord(const char *name, int size) return false; } +static void nestingTooDeep() +{ +#ifndef NO_DEBUG + std::cerr << "*** WARNING #if / #ifdef nesting exceeded the max level " << MAX_LEVEL << std::endl; +#endif +} } // anonymous namespace @@ -1819,6 +1825,12 @@ void Preprocessor::handleIfDirective(PPToken *tk) lex(tk); // consume "if" token Value result; const PPToken lastExpressionToken = evalExpression(tk, result); + + if (m_state.m_ifLevel >= MAX_LEVEL - 1) { + nestingTooDeep(); + return; + } + const bool value = !result.is_zero(); const bool wasSkipping = m_state.m_skipping[m_state.m_ifLevel]; @@ -1945,12 +1957,17 @@ void Preprocessor::handleIfDefDirective(bool checkUndefined, PPToken *tk) value = !value; const bool wasSkipping = m_state.m_skipping[m_state.m_ifLevel]; - ++m_state.m_ifLevel; - m_state.m_trueTest[m_state.m_ifLevel] = value; - m_state.m_skipping[m_state.m_ifLevel] = wasSkipping ? wasSkipping : !value; - if (m_client && !wasSkipping && !value) - startSkippingBlocks(*tk); + if (m_state.m_ifLevel < MAX_LEVEL - 1) { + ++m_state.m_ifLevel; + m_state.m_trueTest[m_state.m_ifLevel] = value; + m_state.m_skipping[m_state.m_ifLevel] = wasSkipping ? wasSkipping : !value; + + if (m_client && !wasSkipping && !value) + startSkippingBlocks(*tk); + } else { + nestingTooDeep(); + } lex(tk); // consume the identifier #ifndef NO_DEBUG diff --git a/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp b/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp index ee326c3d66..3bc5c8eb0d 100644 --- a/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp +++ b/tests/auto/cplusplus/preprocessor/tst_preprocessor.cpp @@ -390,6 +390,7 @@ private slots: void empty_trailing_lines_data(); void undef(); void concat(); + void excessive_nesting(); }; // Remove all #... lines, and 'simplify' string, to allow easily comparing the result @@ -1895,6 +1896,23 @@ void tst_Preprocessor::concat() QCOMPARE(prep.constData(), output.constData()); } +void tst_Preprocessor::excessive_nesting() +{ + Environment env; + Preprocessor preprocess(0, &env); + QByteArray input; + const QByteArray output = + "# 1 \"<stdin>\"\n" + "# 2001 \"<stdin>\"\n"; + for (int i = 0; i < 1000; ++i) + input += "#if FOO\n"; + for (int i = 0; i < 1000; ++i) + input += "#endif\n"; + QByteArray prep = preprocess.run(QLatin1String("<stdin>"), input); + // Output cannot be precisely determined, but it shouldn't crash. + QCOMPARE(prep, output); +} + void tst_Preprocessor::compare_input_output(bool keepComments) { QFETCH(QByteArray, input); |