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pwm: Fix double shift bug 

ANBZ: #12813

commit d27abbfd48 upstream.

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>

Fixes: CVE-2023-52756
Signed-off-by: Xiao Long <xiaolong@openanolis.org>
Signed-off-by: Qinyun Tan <qinyuntan@linux.alibaba.com>
Reviewed-by: Xunlei Pang <xlpang@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/4302
This commit is contained in:
Dan Carpenter 2023-10-25 19:58:18 +08:00 committed by 小龙
parent 97fa0d21f7
commit b1d5df25ed
1 changed files with 2 additions and 2 deletions
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4
include/linux/pwm.h
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@ -44,8 +44,8 @@ struct pwm_args {
};
enum {
PWMF_REQUESTED = 1 << 0,
PWMF_EXPORTED = 1 << 1,
PWMF_REQUESTED = 0,
PWMF_EXPORTED = 1,
};
/*