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[ Upstream commit 516b3eb8c8065f7465f87608d37a7ed08298c7a5 ] The SMB2 Protocol requires that "The first byte of the Direct TCP transport packet header MUST be zero (0x00)"[1]. Commit1c1bcf2d3e("ksmbd: validate smb request protocol id") removed the validation of this 1-byte zero. Add the validation back now. [1]: [MS-SMB2] - v20230227, page 30. https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-SMB2/%5bMS-SMB2%5d-230227.pdf Fixes:1c1bcf2d3e("ksmbd: validate smb request protocol id") Signed-off-by: Li Nan <linan122@huawei.com> Acked-by: Tom Talpey <tom@talpey.com> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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.