Segmentation fault in cppcheck 2.6

[Haddayn]

Hey there.
Cppcheck 2.6 crashes where cppcheck 2.5 does not
By removing as much lines as possible, I ended up with this:

class List
{
public:
    struct ListItem
    {
        int value;
    };
};

int clamp(int i, QVariant v)
{
    QPair<int, int> range = v.value<QPair<int, int>>();
    return i;
}

# gdb cppcheck
(gdb) r --enable=all --std=c++11 --library=qt crash.cpp
Starting program: /usr/bin/cppcheck --enable=all --std=c++11 --library=qt crash.cpp
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Checking crash.cpp ...
crash.cpp:12:27: style: Variable 'range' is assigned a value that is never used. [unreadVariable]
    QPair<int, int> range = v.value<QPair<int, int>>();
                          ^

Program received signal SIGSEGV, Segmentation fault.
0x000055555583562b in Token::linkAt(int) const ()
(gdb) bt
#0  0x000055555583562b in Token::linkAt(int) const ()
#1  0x000055555571737d in CheckUnusedFunctions::parseTokens(Tokenizer const&, char const*, Settings const*) ()
#2  0x000055555571871c in CheckUnusedFunctions::getFileInfo(Tokenizer const*, Settings const*) const ()
#3  0x00005555557406ed in CppCheck::checkNormalTokens(Tokenizer const&) ()
#4  0x000055555574b859 in CppCheck::checkFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::istream&) ()
#5  0x000055555574cd05 in CppCheck::check(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) ()
#6  0x000055555561080b in CppCheckExecutor::check_internal(CppCheck&, int, char const* const*) ()
#7  0x0000555555610cb1 in CppCheckExecutor::check(int, char const* const*) ()
#8  0x00005555555f9c70 in main ()
(gdb) 

[Haddayn]

Managed to trim it a little bit more:

struct ListItem
{
    int value;
};

void clamp()
{
    auto range = v.value<QPair<int, int>>();
}

Reduced parameters to the following:

cppcheck --enable=unusedFunction crash.cpp

[Haddayn]

Could someone please file a ticket? Or is there already a ticket for this?

[Georgiy Komarov]

I can't confirm crash for this case, but there is an internal error. Here is output on the both examples for cppcheck from main branch (commit 27d7609d):

~/D/cppcheck  main   ./cppcheck --enable=unusedFunction test.cpp
Checking test.cpp ...
test.cpp:0:0: error: Internal error. Token::linkAt called with index outside the tokens range. [cppcheckError]

^
test.cpp:6:0: style: The function 'clamp' is never used. [unusedFunction]

^
~/D/cppcheck  main ./cppcheck --enable=all --std=c++11 --library=qt test.cpp
Checking test.cpp ...
test.cpp:12:27: style: Variable 'range' is assigned a value that is never used. [unreadVariable]
    QPair<int, int> range = v.value<QPair<int, int>>();
                          ^
test.cpp:0:0: error: Internal error. Token::linkAt called with index outside the tokens range. [cppcheckError]

^
test.cpp:10:0: style: The function 'clamp' is never used. [unusedFunction]

[CHR]

Ticket is here: https://trac.cppcheck.net/ticket/10552