http://llvm.org/bugs/show_bug.cgi?id=16499
Bug ID: 16499
Summary: False positive warning: Use of memory after it is
freed (use of pointer, not memory)
Product: clang
Version: unspecified
Hardware: PC
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: Static Analyzer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Clang static analyzer give false warning that memory used after it is freed.
Warning is bogus because only pointer value is used, but not memory it points
to.
Example:
>cat test.cpp
#include <iostream> // std::cout
#include <stdlib.h> // malloc
void f() {
char *buffer = (char *)malloc(10);
free(buffer);
std::cout << (void *)buffer << std::endl;
// OK, memory freed, but only pointer value needed
}
>clang++ --analyze test.cpp
test.cpp:7:3: warning: Use of memory after it is freed
std::cout << (void *)buffer << std::endl;
^ ~~~~~~~~~~~~~~
1 warning generated.
This is simplified version of warning that can be found in libc++ sources
libcxx/src/debug.cpp, '__libcpp_db::__erase_i' method.
Environment:
>clang++ --version
Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)
Target: x86_64-apple-darwin11.4.2
Thread model: posix
>uname -a
Darwin mac-osx-x64 11.4.2 Darwin Kernel Version 11.4.2 ...
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