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c3d6569a43
cachefiles_ondemand_init_object() as called from cachefiles_open_file() and
cachefiles_create_tmpfile() does not check if object->ondemand is set
before dereferencing it, leading to an oops something like:
RIP: 0010:cachefiles_ondemand_init_object+0x9/0x41
...
Call Trace:
<TASK>
cachefiles_open_file+0xc9/0x187
cachefiles_lookup_cookie+0x122/0x2be
fscache_cookie_state_machine+0xbe/0x32b
fscache_cookie_worker+0x1f/0x2d
process_one_work+0x136/0x208
process_scheduled_works+0x3a/0x41
worker_thread+0x1a2/0x1f6
kthread+0xca/0xd2
ret_from_fork+0x21/0x33
Fix this by making cachefiles_ondemand_init_object() return immediately if
cachefiles->ondemand is NULL.
Fixes:
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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.