PM: domains: fix integer overflow issues in genpd_parse_state()
authorNikita Zhandarovich <n.zhandarovich@fintech.ru>
Tue, 18 Apr 2023 13:07:43 +0000 (06:07 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 19 Jul 2023 14:21:00 +0000 (16:21 +0200)
commit6368a71dca09a227f26509b7e96d8a49aaf16ac8
tree64faa460da8b13a8bd705fe33db5c04eb81ecced
parent919dd531ebb7514f205ae7aab87994337ebce1f6
PM: domains: fix integer overflow issues in genpd_parse_state()

[ Upstream commit e5d1c8722083f0332dcd3c85fa1273d85fb6bed8 ]

Currently, while calculating residency and latency values, right
operands may overflow if resulting values are big enough.

To prevent this, albeit unlikely case, play it safe and convert
right operands to left ones' type s64.

Found by Linux Verification Center (linuxtesting.org) with static
analysis tool SVACE.

Fixes: 30f604283e05 ("PM / Domains: Allow domain power states to be read from DT")
Signed-off-by: Nikita Zhandarovich <n.zhandarovich@fintech.ru>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/base/power/domain.c