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Kuan-Ting Chen 7cf3bf3cc0 ksmbd: fix slab-out-of-bounds read in smb2_handle_negotiate 
[ Upstream commit d738950f11 ]

Check request_buf length first to avoid out-of-bounds read by
req->DialectCount.

[ 3350.990282] BUG: KASAN: slab-out-of-bounds in smb2_handle_negotiate+0x35d7/0x3e60
[ 3350.990282] Read of size 2 at addr ffff88810ad61346 by task kworker/5:0/276
[ 3351.000406] Workqueue: ksmbd-io handle_ksmbd_work
[ 3351.003499] Call Trace:
[ 3351.006473]  <TASK>
[ 3351.006473]  dump_stack_lvl+0x8d/0xe0
[ 3351.006473]  print_report+0xcc/0x620
[ 3351.006473]  kasan_report+0x92/0xc0
[ 3351.006473]  smb2_handle_negotiate+0x35d7/0x3e60
[ 3351.014760]  ksmbd_smb_negotiate_common+0x7a7/0xf00
[ 3351.014760]  handle_ksmbd_work+0x3f7/0x12d0
[ 3351.014760]  process_one_work+0xa85/0x1780

Cc: stable@vger.kernel.org
Signed-off-by: Kuan-Ting Chen <h3xrabbit@gmail.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-06-21 15:59:12 +02:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.