File 0027-net-http-Do-not-tear-down-socket-if-it-s-already-bee.patch of Package grub2.26830

From ff7d34dd4245f73d2139b6c596aecefbaff5a269 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Tue, 1 Mar 2022 23:14:15 +1100
Subject: [PATCH 27/33] 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 f182d7b871..d0930299b6 100644
--- a/grub-core/net/http.c
+++ b/grub-core/net/http.c
@@ -422,7 +422,7 @@ 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);
@@ -430,7 +430,8 @@ 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