usr@usr-VirtualBox:~/test$ valgrind --leak-check=yes ./test.out 
==2910== Memcheck, a memory error detector

==2910== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.

==2910== Using Valgrind-3.13.0 and LibVEX; rerun with -h for copyright info

==2910== Command: ./test.out

==2910== 

==2910== Invalid free() / delete / delete[] / realloc()

==2910==    at 0x4C32D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

==2910==    by 0x1086C5: main (in /home/usr/test/test.out)

==2910==  Address 0x522f090 is 0 bytes inside a block of size 4 free'd

==2910==    at 0x4C32D3B: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

==2910==    by 0x1086B9: main (in /home/usr/test/test.out)

==2910==  Block was alloc'd at

==2910==    at 0x4C31B0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

==2910==    by 0x1086A9: main (in /home/usr/test/test.out)

==2910== 

==2910== 

==2910== HEAP SUMMARY:

==2910==     in use at exit: 4 bytes in 1 blocks

==2910==   total heap usage: 2 allocs, 2 frees, 8 bytes allocated

==2910== 

==2910== 4 bytes in 1 blocks are definitely lost in loss record 1 of 1

==2910==    at 0x4C31B0F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)

==2910==    by 0x10869B: main (in /home/usr/test/test.out)

==2910== 

==2910== LEAK SUMMARY:

==2910==    definitely lost: 4 bytes in 1 blocks

==2910==    indirectly lost: 0 bytes in 0 blocks

==2910==      possibly lost: 0 bytes in 0 blocks

==2910==    still reachable: 0 bytes in 0 blocks

==2910==         suppressed: 0 bytes in 0 blocks

==2910== 

==2910== For counts of detected and suppressed errors, rerun with: -v

==2910== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)