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a375246fcf
cxl EDAC calls cxl_feature_info() to get the feature information and
if the hardware has no Features support, cxlfs may be passed in as
NULL.
[ 51.957498] BUG: kernel NULL pointer dereference, address: 0000000000000008
[ 51.965571] #PF: supervisor read access in kernel mode
[ 51.971559] #PF: error_code(0x0000) - not-present page
[ 51.977542] PGD 17e4f6067 P4D 0
[ 51.981384] Oops: Oops: 0000 [#1] SMP NOPTI
[ 51.986300] CPU: 49 UID: 0 PID: 3782 Comm: systemd-udevd Not tainted 6.17.0dj
test+ #64 PREEMPT(voluntary)
[ 51.997355] Hardware name: <removed>
[ 52.009790] RIP: 0010:cxl_feature_info+0xa/0x80 [cxl_core]
Add a check for cxlfs before dereferencing it and return -EOPNOTSUPP if
there is no cxlfs created due to no hardware support.
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
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There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.