From c5db70bef7f1ac6627b278fdf06be57bce0ef00b Mon Sep 17 00:00:00 2001
From: wuchangsheng <wuchangsheng2@huawei.com>
Date: Thu, 19 Aug 2021 14:53:14 +0800
Subject: [PATCH] fix event.data.ptr double free due to socket don't free in
lwip_close

---
src/api/sockets.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/api/sockets.c b/src/api/sockets.c
index 7ce9378..ac4cccb 100644
--- a/src/api/sockets.c
+++ b/src/api/sockets.c
@@ -963,18 +963,20 @@ lwip_close(int s)
   struct lwip_sock *sock;
   int is_tcp = 0;
   err_t err;
+  int ret = 0;

   LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_close(%d)\n", s));

 #if USE_LIBOS
-  int ret;
   if (posix_api->is_epfd(s)) {
     return posix_api->epoll_close_fn(s);
   }

+  /* No matter what the result of close, lwip_sock resources should release
+   * to prevent the potential double freee problem caused by reporting events after the close */
   ret = posix_api->close_fn(s);
-  if (ret < 0)
-    return ret;
+  if ((ret < 0) && (errno == EINTR))
+    ret = posix_api->close_fn(s);
   if (posix_api->is_chld == 0)
     clean_host_fd(s);

@@ -1014,7 +1016,7 @@ lwip_close(int s)

   free_socket(sock, is_tcp);
   set_errno(0);
-  return 0;
+  return ret;
 }

 int
--
2.23.0