Type-casting problems

I have a pointer (result) of type void, which is passed (via parameter) 
to another function named preocessResult().

At processResult() a pointer of type int (res) is malloced and data is 
stored in the allocated space.  res is type-casted to void * and 
returned as result.


Everything seems to be ok, but when I run valgrind it gives the 
following warnings:

==3186== Invalid read of size 1
==3186==    at 0x401EB8C: memcpy (mc_replace_strmem.c:406)
==3186==    by 0x804844A: foo (test.c:43)
==3186==    by 0x8048462: main (test.c:54)
==3186==  Address 0x416408B is not stack'd, malloc'd or (recently) free'd
==3186==
==3186== Invalid read of size 1
==3186==    at 0x401EB91: memcpy (mc_replace_strmem.c:406)
==3186==    by 0x804844A: foo (test.c:43)
==3186==    by 0x8048462: main (test.c:54)
==3186==  Address 0x416408A is not stack'd, malloc'd or (recently) free'd
==3186==
==3186== Invalid read of size 1
==3186==    at 0x401EB98: memcpy (mc_replace_strmem.c:406)
==3186==    by 0x804844A: foo (test.c:43)
==3186==    by 0x8048462: main (test.c:54)
==3186==  Address 0x4164089 is not stack'd, malloc'd or (recently) free'd
==3186==
==3186== Invalid read of size 1
==3186==    at 0x401EB9F: memcpy (mc_replace_strmem.c:406)
==3186==    by 0x804844A: foo (test.c:43)
==3186==    by 0x8048462: main (test.c:54)
==3186==  Address 0x4164088 is not stack'd, malloc'd or (recently) free'd


Can any one figures out where is the mistake(s) please?
Here is my code:



void processResult(void **result)
{
     int *res = (int *) malloc(sizeof(int));

     *res = 505;
     *result = res;
}



void foo()
{
     void          *result = NULL;
     struct mytask mtask;


     processResult(&result);

     if (result == NULL)
         bzero( &mtask, sizeof(struct mytask) );
     else
         mtask   = *((struct mytask *) result);
}