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Message-Id: <20221009205226.1202133-10-sashal@kernel.org>
Date: Sun, 9 Oct 2022 16:52:19 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Chao Qin <chao.qin@...el.com>, Zhang Rui <rui.zhang@...el.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Sasha Levin <sashal@...nel.org>, rafael@...nel.org,
linux-pm@...r.kernel.org
Subject: [PATCH AUTOSEL 5.19 10/16] powercap: intel_rapl: fix UBSAN shift-out-of-bounds issue
From: Chao Qin <chao.qin@...el.com>
[ 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@...el.com>
Acked-by: Zhang Rui <rui.zhang@...el.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/powercap/intel_rapl_common.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/powercap/intel_rapl_common.c b/drivers/powercap/intel_rapl_common.c
index a9c99d9e8b42..4aab9d6cc7e1 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);
--
2.35.1
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