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[clang-tidy] Fix a crash in bugprone-not-null-terminated-result check when `__STDC_WANT_LIB_EXT1__` is not a literal. 

If `__STDC_WANT_LIB_EXT1__` is not a literal (e.g. `#define __STDC_WANT_LIB_EXT1__ ((unsigned)1)`) bugprone-not-null-terminated-result check crashes.
Stack dump:
```
 #0 0x0000000002185e6a llvm::sys::PrintStackTrace(llvm::raw_ostream&) (/llvm-project/build/bin/clang-tidy+0x2185e6a)
 #1 0x0000000002183e8c llvm::sys::RunSignalHandlers() (/llvm-project/build/bin/clang-tidy+0x2183e8c)
 #2 0x0000000002183ff3 SignalHandler(int) (/llvm-project/build/bin/clang-tidy+0x2183ff3)
 #3 0x00007f08d91b1390 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
 #4 0x00000000021338bb llvm::StringRef::getAsInteger(unsigned int, llvm::APInt&) const (/llvm-project/build/bin/clang-tidy+0x21338bb)
 #5 0x000000000052051c clang::tidy::bugprone::NotNullTerminatedResultCheck::check(clang::ast_matchers::MatchFinder::MatchResult const&) (/llvm-project/build/bin/clang-tidy+0x52051c)
```

Reviewed By: hokein

Differential Revision: https://reviews.llvm.org/D85525
This commit is contained in:
Aleksandr Platonov 2020-08-10 15:11:25 +03:00
parent bebca662d4
commit dcb8d3b722
2 changed files with 22 additions and 4 deletions
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2
clang-tools-extra/clang-tidy/bugprone/NotNullTerminatedResultCheck.cpp
View File

@ -805,12 +805,14 @@ void NotNullTerminatedResultCheck::check(
// PP->getMacroInfo() returns nullptr if macro has no definition.
if (MI) {
const auto &T = MI->tokens().back();
if (T.isLiteral() && T.getLiteralData()) {
StringRef ValueStr = StringRef(T.getLiteralData(), T.getLength());
llvm::APInt IntValue;
ValueStr.getAsInteger(10, IntValue);
AreSafeFunctionsWanted = IntValue.getZExtValue();
}
}
}
++It;
}

16
clang-tools-extra/test/clang-tidy/checkers/bugprone-not-null-terminated-result-stdc-want-lib-ext1-not-a-literal.c Normal file
View File

@ -0,0 +1,16 @@
// RUN: %check_clang_tidy %s bugprone-not-null-terminated-result %t -- \
// RUN: -- -std=c11 -I %S/Inputs/bugprone-not-null-terminated-result
#include "not-null-terminated-result-c.h"
#define __STDC_LIB_EXT1__ 1
#define __STDC_WANT_LIB_EXT1__ ((unsigned)1)
void f(const char *src) {
char dest[13];
memcpy_s(dest, 13, src, strlen(src) - 1);
// CHECK-MESSAGES: :[[@LINE-1]]:3: warning: the result from calling 'memcpy_s' is not null-terminated [bugprone-not-null-terminated-result]
// CHECK-FIXES: char dest[14];
// CHECK-FIXES-NEXT: strncpy_s(dest, 14, src, strlen(src) - 1);
}