tar -jxvf valgrind-3.13..tar.bz2

cd valgrind-3.13.

sudo ./configure

sudo make

sudo make install

#include <stdio.h>

#include <stdlib.h>

void f()

{

    int *x = malloc( * sizeof(int));

    x[] = ;

}

int main()

{

    f();

    return ;

}

gcc -g val.c -o main.out

valgrind --tool=memcheck --leak-check=yes --show-reachable=yes ./main.out

--leak-check=yes --show-reachable=yes ./main.out

==== Memcheck, a memory error detector

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

==== Using Valgrind-3.13. and LibVEX; rerun with -h for copyright info

==== Command: ./main.out

====

==== Invalid write of size

====    at 0x108668: f (val.c:)

====    by 0x10867E: main (val.c:)

====  Address 0x5857068 is  bytes after a block of size  alloc'd

====    at 0x4C2FB6B: malloc (vg_replace_malloc.c:)

====    by 0x10865B: f (val.c:)

====    by 0x10867E: main (val.c:)

====

====

==== HEAP SUMMARY:

====     in use at exit:  bytes in  blocks

====   total heap usage:  allocs,  frees,  bytes allocated

====

====  bytes in  blocks are definitely lost in loss record  of

====    at 0x4C2FB6B: malloc (vg_replace_malloc.c:)

====    by 0x10865B: f (val.c:)

====    by 0x10867E: main (val.c:)

====

==== LEAK SUMMARY:

====    definitely lost:  bytes in  blocks

====    indirectly lost:  bytes in  blocks

====      possibly lost:  bytes in  blocks

====    still reachable:  bytes in  blocks

====         suppressed:  bytes in  blocks

====

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

==== ERROR SUMMARY:  errors from  contexts (suppressed:  from )