grub2/0107-Fix-malformed-tftp-packets.patch

From 20e077f4b5be64518b8ff996c11973132e8a9ff3 Mon Sep 17 00:00:00 2001
From: Mark Salter <msalter@redhat.com>
Date: Tue, 7 Mar 2017 18:26:17 -0500
Subject: [PATCH 107/123] Fix malformed tftp packets

0088-Normalize-slashes-in-tftp-paths.patch collapses multiple contiguous
slashes in a filename into one slash in the tftp packet filename field.
However, the packet buffer pointer is advanced using the original name.
This leaves unitialized data between the name field and the type field
leading to tftp errors. Use the length of the normalized name to avoid
this.

Signed-off-by: Mark Salter <msalter@redhat.com>
---
 grub-core/net/tftp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/net/tftp.c b/grub-core/net/tftp.c
index 63bbc28ef..c4b5205d0 100644
--- a/grub-core/net/tftp.c
+++ b/grub-core/net/tftp.c
@@ -360,8 +360,8 @@ tftp_open (struct grub_file *file, const char *filename)
   /* Copy and normalize the filename to work-around issues on some tftp
      servers when file names are being matched for remapping. */
   grub_normalize_filename (rrq, filename);
-  rrqlen += grub_strlen (filename) + 1;
-  rrq += grub_strlen (filename) + 1;
+  rrqlen += grub_strlen (rrq) + 1;
+  rrq += grub_strlen (rrq) + 1;
 
   grub_strcpy (rrq, "octet");
   rrqlen += grub_strlen ("octet") + 1;
-- 
2.14.3