File 0028-net-http-Do-not-tear-down-socket-if-it-s-already-bee.patch of Package grub2.26834

From accadebf190ed49482ca4d556c50f5b59c574250 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Tue, 1 Mar 2022 23:14:15 +1100
Subject: [PATCH 28/37] net/http: Do not tear down socket if it's already been
 torn down

It's possible for data->sock to get torn down in tcp error handling.
If we unconditionally tear it down again we will end up doing writes
to an offset of the NULL pointer when we go to tear it down again.

Detect if it has been torn down and don't do it again.

Signed-off-by: Daniel Axtens <dja@axtens.net>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/net/http.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/grub-core/net/http.c b/grub-core/net/http.c
index 5004ecfee4..7dfdb2372e 100644
--- a/grub-core/net/http.c
+++ b/grub-core/net/http.c
@@ -425,7 +425,7 @@ http_establish (struct grub_file *file, grub_off_t offset, int initial)
       return err;
     }
 
-  for (i = 0; !data->headers_recv && i < 100; i++)
+  for (i = 0; data->sock && !data->headers_recv && i < 100; i++)
     {
       grub_net_tcp_retransmit ();
       grub_net_poll_cards (300, &data->headers_recv);
@@ -433,7 +433,8 @@ http_establish (struct grub_file *file, grub_off_t offset, int initial)
 
   if (!data->headers_recv)
     {
-      grub_net_tcp_close (data->sock, GRUB_NET_TCP_ABORT);
+      if (data->sock)
+        grub_net_tcp_close (data->sock, GRUB_NET_TCP_ABORT);
       if (data->err)
 	{
 	  char *str = data->errmsg;
-- 
2.34.1