Auto-port 4.1: Epoll: Use correct value to initialize mmsghdr.msg_namelen (#16467)

netty-project-bot · normanmaurer · web-flow · commit 779fce7ff70d · 2026-03-16T09:16:51.000+01:00
Auto-port of #16460 to 4.1 Cherry-picked commit: 29a5efc --- Motivation: We did use the incorrect value for the msg_namelen and so could in theory result in an overflow if the kernel really use this value for the last element. Modifications: Use correct value Result: No risk of overflow during recvmmsg Co-authored-by: Norman Maurer <norman_maurer@apple.com>
diff --git a/transport-native-epoll/src/main/c/netty_epoll_native.c b/transport-native-epoll/src/main/c/netty_epoll_native.c
@@ -638,7 +638,7 @@ static jint netty_epoll_native_recvmmsg0(JNIEnv* env, jclass clazz, jint fd, jbo
         msg[i].msg_hdr.msg_iovlen = (*env)->GetIntField(env, packet, packetCountFieldId);
 
         msg[i].msg_hdr.msg_name = addr + i;
-        msg[i].msg_hdr.msg_namelen = (socklen_t) addrSize;
+        msg[i].msg_hdr.msg_namelen = (socklen_t) storageSize;
 
         if (cntrlbuf != NULL) {
             msg[i].msg_hdr.msg_control =  cntrlbuf + i * storageSize;
