Merge branch 'bmk/20251110/limit_sctp_event_size/OTP-19863' into maint

Author: bmk

erts/emulator/drivers/common/inet_drv.c

@@ -8839,7 +8839,12 @@ static int sctp_set_opts(inet_descriptor* desc, char* ptr, int len)
 	    proto   = IPPROTO_SCTP;
 	    type    = SCTP_EVENTS;
 	    arg_ptr = (char*) (&arg.es);
+#if defined(__linux__)
+            arg_sz  = offsetof(struct sctp_event_subscribe,
+                               sctp_adaptation_layer_event) + 1;
+#else
 	    arg_sz  = sizeof  ( arg.es);
+#endif
 	    break;
 	}
 	/* The following is not available on

erts/emulator/nifs/common/prim_socket_nif.c

@@ -8018,6 +8018,10 @@ ERL_NIF_TERM esock_setopt_sctp_events(ErlNifEnv*       env,
 {
     struct    sctp_event_subscribe events;
     BOOLEAN_T error;
+#if defined(__linux__)
+    int       last_opt = offsetof(struct sctp_event_subscribe,
+                                  sctp_adaptation_layer_event) + 1;
+#endif
 
     SSDBG( descP,
            ("SOCKET", "esock_setopt_sctp_events {%d} -> entry with"
@@ -8055,20 +8059,32 @@ ERL_NIF_TERM esock_setopt_sctp_events(ErlNifEnv*       env,
 #if defined(HAVE_STRUCT_SCTP_EVENT_SUBSCRIBE_SCTP_AUTHENTICATION_EVENT)
     events.sctp_authentication_event =
         esock_setopt_sctp_event(env, eVal, atom_authentication, &error);
+#if defined(__linux__)
+    last_opt = offsetof(struct sctp_event_subscribe,
+                        sctp_authentication_event) + 1;
+#endif
 #endif
 
 #if defined(HAVE_STRUCT_SCTP_EVENT_SUBSCRIBE_SCTP_SENDER_DRY_EVENT)
     events.sctp_sender_dry_event =
         esock_setopt_sctp_event(env, eVal, atom_sender_dry, &error);
+#if defined(__linux__)
+    last_opt = offsetof(struct sctp_event_subscribe, sctp_sender_dry_event) + 1;
+#endif
 #endif
 
     if (error) {
         goto invalid;
     } else {
         ERL_NIF_TERM result;
+#if defined(__linux__)
+        int arg_sz = last_opt;
+#else
+        int arg_sz = sizeof(events);
+#endif
 
         result = esock_setopt_level_opt(env, descP, level, opt,
-                                        &events, sizeof(events));
+                                        &events, arg_sz);
         SSDBG( descP,
                ("SOCKET",
                 "esock_setopt_sctp_events {%d} -> set events -> %T\r\n",