Segfault(SIGSEV) from CSVStat::get_mins

[jihyunhillpark]

Hi, I found returning the number of columns in CSVStat::get_ mins of include/internal/csv_stat.cpp’(commit 6323ff8) crashes with the attached .csv file (test.csv). I think this may be related to the line #41-42 of include/internal/csv_stat.cpp. The crash was observed on Ubuntu 18.04.3 with kernel 4.15.0-72-generic and x86_64.

The crash can be reproduced by the following command:
$./csv_stat test.csv

Here’s the the crash stack trace taken with GDB:

#0 0x00005555555da731 in std::__1::allocator::construct<long double, long double const&> (this=,
__p=0x555555a2e520, __args=) at /home/cockatiel01/LLVM/bin/../include/c++/v1/memory:1811
#1 std::__1::allocator_traits<std::__1::allocator >::__construct<long double, long double const&> (__a=...,
__p=0x555555a2e520, __args=) at /home/cockatiel01/LLVM/bin/../include/c++/v1/memory:1716
#2 std::__1::allocator_traits<std::__1::allocator >::construct<long double, long double const&> (__a=...,
__p=0x555555a2e520, __args=) at /home/cockatiel01/LLVM/bin/../include/c++/v1/memory:1562
#3 std::__1::vector<long double, std::__1::allocator >::__push_back_slow_path<long double const&> (
this=0x7fffffffdbc0, __x=) at /home/cockatiel01/LLVM/bin/../include/c++/v1/vector:1613
#4 0x00005555555c5821 in std::__1::vector<long double, std::__1::allocator >::push_back (this=,
__x=) at /home/cockatiel01/LLVM/bin/../include/c++/v1/vector:1632
#5 csv::CSVStat::get_mins (this=0x7fffffffdc50)
at /home/jihyunee/ang-csv-parser/csv-parser-fast/include/internal/csv_stat.cpp:52
#6 0x0000555555570604 in main (argc=, argv=)
at /home/jihyunee/ang-csv-parser/csv-parser-fast/programs/csv_stats.cpp:15

This crash was found with Angora fuzzer, and test.csv is originated from ints_join.csv
in tests/data/fake_data directory.

Hope this help.
test.csv.zip