Patch "CIFS: Fix maximum SMB2 header size" has been added to the 4.12-stable tree

Patch "CIFS: Fix maximum SMB2 header size" has been added to the 4.12-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    CIFS: Fix maximum SMB2 header size

to the 4.12-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:
     cifs-fix-maximum-smb2-header-size.patch
and it can be found in the queue-4.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9e37b1784f2be9397a903307574ee565bbadfd75 Mon Sep 17 00:00:00 2001
From: Pavel Shilovsky <pshilov@microsoft.com>
Date: Thu, 24 Aug 2017 15:16:40 -0700
Subject: CIFS: Fix maximum SMB2 header size

From: Pavel Shilovsky <pshilov@microsoft.com>

commit 9e37b1784f2be9397a903307574ee565bbadfd75 upstream.

Currently the maximum size of SMB2/3 header is set incorrectly which
leads to hanging of directory listing operations on encrypted SMB3
connections. Fix this by setting the maximum size to 170 bytes that
is calculated as RFC1002 length field size (4) + transform header
size (52) + SMB2 header size (64) + create response size (56).

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Acked-by: Sachin Prabhu <sprabhu@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/cifs/smb2pdu.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -84,8 +84,8 @@
 
 #define NUMBER_OF_SMB2_COMMANDS	0x0013
 
-/* BB FIXME - analyze following length BB */
-#define MAX_SMB2_HDR_SIZE 0x78 /* 4 len + 64 hdr + (2*24 wct) + 2 bct + 2 pad */
+/* 4 len + 52 transform hdr + 64 hdr + 56 create rsp */
+#define MAX_SMB2_HDR_SIZE 0x00b0
 
 #define SMB2_PROTO_NUMBER cpu_to_le32(0x424d53fe)
 #define SMB2_TRANSFORM_PROTO_NUM cpu_to_le32(0x424d53fd)


Patches currently in stable-queue which might be from pshilov@microsoft.com are

queue-4.12/cifs-fix-maximum-smb2-header-size.patch
queue-4.12/cifs-remove-endian-related-sparse-warning.patch