--- src/unix/udp.c.orig	2020-04-15 16:31:21 UTC

+++ src/unix/udp.c

@@ -214,11 +214,14 @@ static int uv__udp_recvmmsg(uv_udp_t* handle, uv_buf_t

     else

       handle->recv_cb(handle, UV__ERR(errno), buf, NULL, 0);

   } else {

-    /* pass each chunk to the application */

-    for (k = 0; k < (size_t) nread && handle->recv_cb != NULL; k++) {

-      flags = UV_UDP_MMSG_CHUNK;

+    /* count to zero, so the buffer base comes last */

+    for (k = nread; k > 0 && handle->recv_cb != NULL;) {

+      k--;

+      flags = 0;

       if (msgs[k].msg_hdr.msg_flags & MSG_TRUNC)

         flags |= UV_UDP_PARTIAL;

+      if (k != 0)

+        flags |= UV_UDP_MMSG_CHUNK;

       chunk_buf = uv_buf_init(iov[k].iov_base, iov[k].iov_len);

       handle->recv_cb(handle,

@@ -227,10 +230,6 @@ static int uv__udp_recvmmsg(uv_udp_t* handle, uv_buf_t

                       msgs[k].msg_hdr.msg_name,

                       flags);

     }

-

-    /* one last callback so the original buffer is freed */

-    if (handle->recv_cb != NULL)

-      handle->recv_cb(handle, 0, buf, NULL, 0);

   }

   return nread;

 }