This is a note to let you know that I've just added the patch titled
staging: ncpfs: memory corruption in ncp_read_kernel()
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
staging-ncpfs-memory-corruption-in-ncp_read_kernel.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 4c41aa24baa4ed338241d05494f2c595c885af8f Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Mon, 19 Mar 2018 14:07:45 +0300
Subject: staging: ncpfs: memory corruption in ncp_read_kernel()
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
commit 4c41aa24baa4ed338241d05494f2c595c885af8f upstream.
If the server is malicious then *bytes_read could be larger than the
size of the "target" buffer. It would lead to memory corruption when we
do the memcpy().
Reported-by: Dr Silvio Cesare of InfoSect <Silvio Cesare <silvio.cesare@xxxxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/ncpfs/ncplib_kernel.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/fs/ncpfs/ncplib_kernel.c
+++ b/fs/ncpfs/ncplib_kernel.c
@@ -980,6 +980,10 @@ ncp_read_kernel(struct ncp_server *serve
goto out;
}
*bytes_read = ncp_reply_be16(server, 0);
+ if (*bytes_read > to_read) {
+ result = -EINVAL;
+ goto out;
+ }
source = ncp_reply_data(server, 2 + (offset & 1));
memcpy(target, source, *bytes_read);
Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are
queue-4.9/staging-ncpfs-memory-corruption-in-ncp_read_kernel.patch