How to free the void pointer

[sureshkatne]

HI,
I allocated void pointer using malloc. Please let me know how to free this memory?

typedef struct_t node {
int a;
char b;
void *c;
void *d;
}node_t;

node_t *dp;

in my program, I assigned some head to the pointer. I am allocating like this.

dp = phead.
dp->c = (void*)malloc(10);
dp->d = (void*)malloc(20);

Now I have to free the memory. I used at last in the program like this.

if (dp->c) free(dp->c)
if (dp->d) free(dp->d)

But when I executing it is getting crashed. Let me know the solution for this.

[gerard4143]

You should be able to free the allocated memory. Maybe its something else, did you try running your program in a debugger?

[kika]

dp = phead;
dp->c = (void*)malloc(10);
dp->d = (void*)malloc(20);

Does this 'phead' pointer variable really have allocated memory?
Check that! If it is incorrect or missing, then it is likely that you get this kind of behaviour.

[Rubberman]

Most likely something in your program has "walked on" the pointers, resulting in corrupted memory, hence the crash. You need to run your program in the debugger and set a watch point on dp or phead to see when it is modified. Also, if something deallocated phead, or phead is a pointer to an automatic variable that went out of scope, then you will get the same results.