Chao Qin 3eb0ba7037 powercap: intel_rapl: fix UBSAN shift-out-of-bounds issue ...

[ Upstream commit 2d93540014387d1c73b9ccc4d7895320df66d01b ]

When value < time_unit, the parameter of ilog2() will be zero and
the return value is -1. u64(-1) is too large for shift exponent
and then will trigger shift-out-of-bounds:

shift exponent 18446744073709551615 is too large for 32-bit type 'int'
Call Trace:
 rapl_compute_time_window_core
 rapl_write_data_raw
 set_time_window
 store_constraint_time_window_us

Signed-off-by: Chao Qin <chao.qin@intel.com>
Acked-by: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2022-10-26 13:17:08 +02:00

..

intel_rapl.c

powercap: intel_rapl: fix UBSAN shift-out-of-bounds issue

2022-10-26 13:17:08 +02:00

Kconfig

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Makefile

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powercap_sys.c

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