Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 6.6 6/6] pwm: Fix double shift bug | Date | Tue, 14 Nov 2023 22:33:40 -0500 |
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From: Dan Carpenter <dan.carpenter@linaro.org>
[ Upstream commit d27abbfd4888d79dd24baf50e774631046ac4732 ]
These enums are passed to set/test_bit(). The set/test_bit() functions take a bit number instead of a shifted value. Passing a shifted value is a double shift bug like doing BIT(BIT(1)). The double shift bug doesn't cause a problem here because we are only checking 0 and 1 but if the value was 5 or above then it can lead to a buffer overflow.
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org> Reviewed-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org> Signed-off-by: Thierry Reding <thierry.reding@gmail.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- include/linux/pwm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/linux/pwm.h b/include/linux/pwm.h index d2f9f690a9c14..fe0f38ce1bdee 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -41,8 +41,8 @@ struct pwm_args { }; enum { - PWMF_REQUESTED = 1 << 0, - PWMF_EXPORTED = 1 << 1, + PWMF_REQUESTED = 0, + PWMF_EXPORTED = 1, }; /* -- 2.42.0
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