This program will tell you
1. line number
2. source file name
3. starting address
4. total bytes .
If this is your program then go to that line and call free function for that pointer which is pointing to memory and not deallocated.

If that is not your program means it may be in binary then You have four information by running this program , then take a pointer which will point to constant address as above 3.
and set the offset as required based on as above 4 info. then call free function for this pointer.