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| author | Chao Qin <chao.qin@intel.com> | 2022-09-20 09:08:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-10-26 14:25:44 +0300 |
| commit | 708b9abe1b4a2f050a483db4b7edfc446b13df1f (patch) | |
| tree | 114aef860676df64251350def44418d692ebd9d0 /drivers/powercap | |
| parent | b434edb0e9d159741f909eeb20843ae008e30e62 (diff) | |
| download | linux-708b9abe1b4a2f050a483db4b7edfc446b13df1f.tar.xz | |
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>
Diffstat (limited to 'drivers/powercap')
| -rw-r--r-- | drivers/powercap/intel_rapl_common.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c index a13a07f475d2..285420c1eb7c 100644 --- a/drivers/powercap/intel_rapl_common.c +++ b/drivers/powercap/intel_rapl_common.c @@ -938,6 +938,9 @@ static u64 rapl_compute_time_window_core(struct rapl_package *rp, u64 value, y = value & 0x1f; value = (1 << y) * (4 + f) * rp->time_unit / 4; } else { + if (value < rp->time_unit) + return 0; + do_div(value, rp->time_unit); y = ilog2(value); f = div64_u64(4 * (value - (1 << y)), 1 << y); |