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grub2/SOURCES/0389-net-tftp-Fix-dangling-...

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From 0000000000000000000000000000000000000000 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>
---
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 b9a4b607a..aa0424dce 100644
--- a/grub-core/net/tftp.c
+++ b/grub-core/net/tftp.c
@@ -444,6 +444,7 @@ tftp_close (struct grub_file *file)
grub_net_udp_close (data->sock);
}
grub_free (data);
+ file->data = NULL;
return GRUB_ERR_NONE;
}