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4f24ecff01
pmc_core_mtpmc_link_status() an pmc_core_check_read_lock_bit() use
test_bit() on local 32-bit variable. This causes out-of-bounds
access since test_bit() expects object at least of 'unsigned long' size:
BUG: KASAN: stack-out-of-bounds in pmc_core_probe+0x3aa/0x3b0
Call Trace:
__asan_report_load_n_noabort+0x5c/0x80
pmc_core_probe+0x3aa/0x3b0
local_pci_probe+0xf9/0x1e0
pci_device_probe+0x27b/0x350
driver_probe_device+0x419/0x830
__driver_attach+0x15f/0x1d0
bus_for_each_dev+0x129/0x1d0
driver_attach+0x42/0x70
bus_add_driver+0x385/0x690
driver_register+0x1a9/0x3d0
__pci_register_driver+0x1a2/0x290
intel_pmc_core_driver_init+0x19/0x1b
do_one_initcall+0x12e/0x280
kernel_init_freeable+0x57c/0x623
kernel_init+0x13/0x140
ret_from_fork+0x2e/0x40
Fix this by open coding bit test. While at it, also refactor this code
a little bit.
Fixes: 173943b3dae5 ("platform/x86: intel_pmc_core: ModPhy core lanes pg status")
Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
[andy: reverted not related changes, used BIT() macro]
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.