extmod/modlwip: Fix IGMP address type when IPv6 is enabled.

dpgeorge · dpgeorge · commit 6f327684b75c · 2024-11-18T23:27:13.000+11:00
This was missed in 628abf8. The the bug was that, when IPv6 is enabled, the `sizeof(ip_addr_t)` is much larger than IPv4 size, which is what's needed for IGMP addressing. Fixes issue micropython#16100. Signed-off-by: Damien George <damien@micropython.org>
diff --git a/extmod/modlwip.c b/extmod/modlwip.c
@@ -1432,7 +1432,7 @@ static mp_obj_t lwip_socket_setsockopt(size_t n_args, const mp_obj_t *args) {
         case IP_DROP_MEMBERSHIP: {
             mp_buffer_info_t bufinfo;
             mp_get_buffer_raise(args[3], &bufinfo, MP_BUFFER_READ);
-            if (bufinfo.len != sizeof(ip_addr_t) * 2) {
+            if (bufinfo.len != sizeof(MP_IGMP_IP_ADDR_TYPE) * 2) {
                 mp_raise_ValueError(NULL);
             }
 

Original file line number	Diff line number	Diff line change
`@@ -1432,7 +1432,7 @@ static mp_obj_t lwip_socket_setsockopt(size_t n_args, const mp_obj_t *args) {`
`1432`	`1432`	`case IP_DROP_MEMBERSHIP: {`
`1433`	`1433`	`mp_buffer_info_t bufinfo;`
`1434`	`1434`	`mp_get_buffer_raise(args[3], &bufinfo, MP_BUFFER_READ);`
`1435`		`- if (bufinfo.len != sizeof(ip_addr_t) * 2) {`
	`1435`	`+ if (bufinfo.len != sizeof(MP_IGMP_IP_ADDR_TYPE) * 2) {`
`1436`	`1436`	`mp_raise_ValueError(NULL);`
`1437`	`1437`	`}`
`1438`	`1438`