This is a note to let you know that I've just added the patch titled
pwm: Fix double shift bug
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pwm-fix-double-shift-bug.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 078c6f9464731c9636eb1f5e4039874576f37278
Author: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Wed Oct 25 14:58:18 2023 +0300
pwm: Fix double shift bug
[ 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@xxxxxxxxxx>
Reviewed-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Reviewed-by: Sam Protsenko <semen.protsenko@xxxxxxxxxx>
Signed-off-by: Thierry Reding <thierry.reding@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/pwm.h b/include/linux/pwm.h
index a13ff383fa1d5..c0cf6613373f9 100644
--- a/include/linux/pwm.h
+++ b/include/linux/pwm.h
@@ -44,8 +44,8 @@ struct pwm_args {
};
enum {
- PWMF_REQUESTED = 1 << 0,
- PWMF_EXPORTED = 1 << 1,
+ PWMF_REQUESTED = 0,
+ PWMF_EXPORTED = 1,
};
/*
