parseURL(const char * url,
         char * hostname, unsigned short * port,
         char * * path, unsigned int * scope_id)
{
	char * p1, *p2, *p3;
	if(!url)
		return 0;
	p1 = strstr(url, "://");
	if(!p1)
		return 0;
	p1 += 3;
	if(  (url[0]!='h') || (url[1]!='t')
	   ||(url[2]!='t') || (url[3]!='p'))
		return 0;
	memset(hostname, 0, MAXHOSTNAMELEN + 1);
	if(*p1 == '[')
	{
		/* IP v6 : http://[2a00:1450:8002::6a]/path/abc */
		char * scope;
		scope = strchr(p1, '%');
		p2 = strchr(p1, ']');
		if(p2 && scope && scope < p2 && scope_id) {
			/* parse scope */
#ifdef IF_NAMESIZE
			char tmp[IF_NAMESIZE];
			int l;
			scope++;
			/* "%25" is just '%' in URL encoding */
			if(scope[0] == '2' && scope[1] == '5')
				scope += 2;	/* skip "25" */
			l = p2 - scope;
			if(l >= IF_NAMESIZE)
				l = IF_NAMESIZE - 1;
			memcpy(tmp, scope, l);
			tmp[l] = '\0';
			*scope_id = if_nametoindex(tmp);
			if(*scope_id == 0) {
				*scope_id = (unsigned int)strtoul(tmp, NULL, 10);
			}
#else
			/* under windows, scope is numerical */
			char tmp[8];
			int l;
			scope++;
			/* "%25" is just '%' in URL encoding */
			if(scope[0] == '2' && scope[1] == '5')
				scope += 2;	/* skip "25" */
			l = p2 - scope;
			if(l >= sizeof(tmp))
				l = sizeof(tmp) - 1;
			memcpy(tmp, scope, l);
			tmp[l] = '\0';
			*scope_id = (unsigned int)strtoul(tmp, NULL, 10);
#endif
		}
		p3 = strchr(p1, '/');
		if(p2 && p3)
		{
			p2++;
			strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p2-p1)));
			if(*p2 == ':')
			{
				*port = 0;
				p2++;
				while( (*p2 >= '0') && (*p2 <= '9'))
				{
					*port *= 10;
					*port += (unsigned short)(*p2 - '0');
					p2++;
				}
			}
			else
			{
				*port = 80;
			}
			*path = p3;
			return 1;
		}
	}
	p2 = strchr(p1, ':');
	p3 = strchr(p1, '/');
	if(!p3)
		return 0;
	if(!p2 || (p2>p3))
	{
		strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p3-p1)));
		*port = 80;
	}
	else
	{
		strncpy(hostname, p1, MIN(MAXHOSTNAMELEN, (int)(p2-p1)));
		*port = 0;
		p2++;
		while( (*p2 >= '0') && (*p2 <= '9'))
		{
			*port *= 10;
			*port += (unsigned short)(*p2 - '0');
			p2++;
		}
	}
	*path = p3;
	return 1;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.