From 7d05a8298e6a54bfae0038841462443f21da3535 Mon Sep 17 00:00:00 2001 From: Mark Salter Date: Tue, 7 Mar 2017 18:26:17 -0500 Subject: [PATCH] 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 --- 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 5ca0a96a6f6..dcd82494309 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;