boot/grub2/0051-net-tftp-Fix-dangling-memory-pointer.patch

From 0cb838b281a68b536a09681f9557ea6a7ac5da7a Mon Sep 17 00:00:00 2001
From: Darren Kenny <darren.kenny@oracle.com>
Date: Fri, 19 Feb 2021 17:12:23 +0000
Subject: [PATCH] net/tftp: Fix dangling memory pointer

The static code analysis tool, Parfait, reported that the valid of
file->data was left referencing memory that was freed by the call to
grub_free(data) where data was initialized from file->data.

To ensure that there is no unintentional access to this memory
referenced by file->data we should set the pointer to NULL.

Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Signed-off-by: Stefan Sørensen <stefan.sorensen@spectralink.com>
---
 grub-core/net/tftp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/grub-core/net/tftp.c b/grub-core/net/tftp.c
index b4297bc..c106704 100644
--- a/grub-core/net/tftp.c
+++ b/grub-core/net/tftp.c
@@ -406,6 +406,7 @@ tftp_close (struct grub_file *file)
       grub_net_udp_close (data->sock);
     }
   grub_free (data);
+  file->data = NULL;
   return GRUB_ERR_NONE;
 }
 
-- 
2.14.2