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commit067baa9a37upstream. By not checking whether llseek is NULL, this might jump to NULL. Also, it doesn't check FMODE_LSEEK. Fix this by using vfs_llseek(), which always does the right thing. Fixes:f441584858("cifsd: add file operations") Cc: stable@vger.kernel.org Cc: linux-cifs@vger.kernel.org Cc: Ronnie Sahlberg <lsahlber@redhat.com> Cc: Hyunchul Lee <hyc.lee@gmail.com> Cc: Sergey Senozhatsky <sergey.senozhatsky@gmail.com> Reviewed-by: Namjae Jeon <linkinjeon@kernel.org> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.