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| author | Chao Qin <chao.qin@intel.com> | 2022-09-20 14:08:26 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-09-21 20:16:15 +0200 |
| commit | 2d93540014387d1c73b9ccc4d7895320df66d01b (patch) | |
| tree | e6054b5bfebf3e81b14d55e878e6c5a4a5e1e770 /drivers/powercap | |
| parent | 0d7a23b5f8e162bf2c5caab06f5df4aee2619073 (diff) | |
| download | linux-2d93540014387d1c73b9ccc4d7895320df66d01b.tar.gz linux-2d93540014387d1c73b9ccc4d7895320df66d01b.tar.bz2 linux-2d93540014387d1c73b9ccc4d7895320df66d01b.zip | |
powercap: intel_rapl: fix UBSAN shift-out-of-bounds issue
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>
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 6812c1ca3100..4688d0647b22 100644 --- a/drivers/powercap/intel_rapl_common.c +++ b/drivers/powercap/intel_rapl_common.c @@ -994,6 +994,9 @@ 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); |