From e33da263e9658bfe870ea7836fbbd72f246d7dbd Mon Sep 17 00:00:00 2001 From: Patrick Rudolph Date: Fri, 9 Sep 2022 14:59:53 +0200 Subject: [PATCH] regulator: core: Prevent integer underflow [ Upstream commit 8d8e16592022c9650df8aedfe6552ed478d7135b ] By using a ratio of delay to poll_enabled_time that is not integer time_remaining underflows and does not exit the loop as expected. As delay could be derived from DT and poll_enabled_time is defined in the driver this can easily happen. Use a signed iterator to make sure that the loop exits once the remaining time is negative. Signed-off-by: Patrick Rudolph Link: https://lore.kernel.org/r/20220909125954.577669-1-patrick.rudolph@9elements.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/regulator/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 43613db7af75..aa4d78b02483 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2636,7 +2636,7 @@ static int _regulator_do_enable(struct regulator_dev *rdev) * expired, return -ETIMEDOUT. */ if (rdev->desc->poll_enabled_time) { - unsigned int time_remaining = delay; + int time_remaining = delay; while (time_remaining > 0) { _regulator_enable_delay(rdev->desc->poll_enabled_time);