Memory leak in c code - objective-c

Question

I wrote this method using some non objective c code and instruments is telling me there is a leak. Not only that, but the free(char*) crashes...
Any help would be appreciated.
Thanks
NSArray *keys = #[#"#\"NSMutableArray\""];
//Init result
id result = object;
//Iterate every key
for (id key in [dict allKeys]) {
//Convert key to const char
const char * c =(const char*)malloc(sizeof(uint32_t));
c = [key cStringUsingEncoding:NSASCIIStringEncoding];
//Use c to see if the class has this property
if (class_getProperty([object class], c)) {
//get the property
objc_property_t property = class_getProperty([result class], c);
//Get the property name and type
const char *name = (const char*)malloc(sizeof(uint32_t));
const char *type = (const char*)malloc(sizeof(uint32_t));
name = property_getName(property);
type =property_copyAttributeValue(property, "T");
//Cast const char to string
NSString *pNameString = [NSString stringWithFormat:#"%s",name];
NSString *typeString = [NSString stringWithFormat:#"%s",type];
//Add relationships
if ([keys containsObject:typeString]) {
//Get array of objects
NSArray *relationship = [dict objectForKey:pNameString];
NSMutableArray *allSubObjects = [[NSMutableArray alloc]init];
//Parse each individual object
for (NSDictionary *relationshipObj in relationship) {
//Create class from relationship
Class class = NSClassFromString(pNameString);
//Create object
id sub = [self makeObject:[[class alloc]init] fromDictionary:relationshipObj];
[allSubObjects addObject:sub];
}
[result setValue:allSubObjects forKey:pNameString];
}else{
//If so set the property for the key
[result setValue:[dict objectForKey:key] forKey:key];
}
free((char*)name);
free((char*)type);
free(property);
}else{
//NSLog(#"%# did not respond to : %#", result, key);
}
free((void*)c);
}
//Return result
return result;

Answer 1

It's crashing because you allocate c, then overwrite the pointer with whatever cStringUsingEncoding: returns, then try to free what was returned by cStringusingEncoding, which your code doesn't own. Also, then the original pointer is leaked.
Frome the docs for cStringUsingEncoding :
The returned C string is guaranteed to be valid only until either the receiver is freed, or until the current memory is emptied, whichever occurs first. You should copy the C string or use getCString:maxLength:encoding: if it needs to store the C string beyond this time.