Segmentation Fault on Free()

[Stiletto]

Hello,
When I try to free() the following allocated memory I get segmentation fault. Why is that and how can I slove this?
Thanks in advance.

typedef struct filterNode_st{
	void* data;
	struct filterNode_st* next;
} filterNode;

unsigned int binNetIP=(binHostIP >> (32-mask));
newNode->data=(unsigned int*)malloc(sizeof(unsigned int));
newNode->data=(unsigned int*)binNetIP;

void destroyFilter(){
	filterNode* filter=filterHead;
	filterNode* trav=filter->next;
	while (filter){
		free(filter->data);   //<- This line triggers Segmentation Fault
		trav=filter;
		filter=filter->next;
		free(trav);
	}
}

[KCfromNC]

Hello,
When I try to free() the following allocated memory I get segmentation fault. Why is that and how can I slove this?
Thanks in advance.

typedef struct filterNode_st{
	void* data;
	struct filterNode_st* next;
} filterNode;

unsigned int binNetIP=(binHostIP >> (32-mask));
newNode->data=(unsigned int*)malloc(sizeof(unsigned int));
newNode->data=(unsigned int*)binNetIP;

You're setting data to point to malloced space and then setting it to something else on the very next line. This means that whatever space you just malloced is lost and you're trying to free something other than what you malloced.

You need to dereference newNode->data in the second assignment so you're putting binNetIP in the newly allocated space rather than overwriting the pointer to that space.

[Stiletto]

Ofcourse. Thank you.