* [PATCH] ALSA: usb-audio: fix sign unintended sign extension on left shifts
@ 2019-06-27 16:43 ` Colin King
0 siblings, 0 replies; 5+ messages in thread
From: Colin King @ 2019-06-27 16:43 UTC (permalink / raw)
To: Jaroslav Kysela, Takashi Iwai, alsa-devel; +Cc: kernel-janitors, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
There are a couple of left shifts of unsigned 8 bit values that
first get promoted to signed ints and hence get sign extended
on the shift if the top bit of the 8 bit values are set. Fix
this by casting the 8 bit values to unsigned ints to stop the
unintentional sign extension.
Addresses-Coverity: ("Unintended sign extension")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
sound/usb/mixer_quirks.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 1f6011f36bb0..199fa157a411 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -741,7 +741,7 @@ static int snd_ni_control_init_val(struct usb_mixer_interface *mixer,
return err;
}
- kctl->private_value |= (value << 24);
+ kctl->private_value |= ((unsigned int)value << 24);
return 0;
}
@@ -902,7 +902,7 @@ static int snd_ftu_eff_switch_init(struct usb_mixer_interface *mixer,
if (err < 0)
return err;
- kctl->private_value |= value[0] << 24;
+ kctl->private_value |= (unsigned int)value[0] << 24;
return 0;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH] ALSA: usb-audio: fix sign unintended sign extension on left shifts
@ 2019-06-27 16:43 ` Colin King
0 siblings, 0 replies; 5+ messages in thread
From: Colin King @ 2019-06-27 16:43 UTC (permalink / raw)
To: Jaroslav Kysela, Takashi Iwai, alsa-devel; +Cc: kernel-janitors, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
There are a couple of left shifts of unsigned 8 bit values that
first get promoted to signed ints and hence get sign extended
on the shift if the top bit of the 8 bit values are set. Fix
this by casting the 8 bit values to unsigned ints to stop the
unintentional sign extension.
Addresses-Coverity: ("Unintended sign extension")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
sound/usb/mixer_quirks.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index 1f6011f36bb0..199fa157a411 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -741,7 +741,7 @@ static int snd_ni_control_init_val(struct usb_mixer_interface *mixer,
return err;
}
- kctl->private_value |= (value << 24);
+ kctl->private_value |= ((unsigned int)value << 24);
return 0;
}
@@ -902,7 +902,7 @@ static int snd_ftu_eff_switch_init(struct usb_mixer_interface *mixer,
if (err < 0)
return err;
- kctl->private_value |= value[0] << 24;
+ kctl->private_value |= (unsigned int)value[0] << 24;
return 0;
}
--
2.20.1
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] ALSA: usb-audio: fix sign unintended sign extension on left shifts
2019-06-27 16:43 ` Colin King
(?)
@ 2019-06-28 8:37 ` Takashi Iwai
-1 siblings, 0 replies; 5+ messages in thread
From: Takashi Iwai @ 2019-06-28 8:37 UTC (permalink / raw)
To: Colin King; +Cc: alsa-devel, Jaroslav Kysela, kernel-janitors, linux-kernel
On Thu, 27 Jun 2019 18:43:08 +0200,
Colin King wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> There are a couple of left shifts of unsigned 8 bit values that
> first get promoted to signed ints and hence get sign extended
> on the shift if the top bit of the 8 bit values are set. Fix
> this by casting the 8 bit values to unsigned ints to stop the
> unintentional sign extension.
>
> Addresses-Coverity: ("Unintended sign extension")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Applied now. Thanks.
Takashi
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] ALSA: usb-audio: fix sign unintended sign extension on left shifts
@ 2019-06-28 8:37 ` Takashi Iwai
0 siblings, 0 replies; 5+ messages in thread
From: Takashi Iwai @ 2019-06-28 8:37 UTC (permalink / raw)
To: Colin King; +Cc: alsa-devel, Jaroslav Kysela, kernel-janitors, linux-kernel
On Thu, 27 Jun 2019 18:43:08 +0200,
Colin King wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> There are a couple of left shifts of unsigned 8 bit values that
> first get promoted to signed ints and hence get sign extended
> on the shift if the top bit of the 8 bit values are set. Fix
> this by casting the 8 bit values to unsigned ints to stop the
> unintentional sign extension.
>
> Addresses-Coverity: ("Unintended sign extension")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Applied now. Thanks.
Takashi
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] ALSA: usb-audio: fix sign unintended sign extension on left shifts
@ 2019-06-28 8:37 ` Takashi Iwai
0 siblings, 0 replies; 5+ messages in thread
From: Takashi Iwai @ 2019-06-28 8:37 UTC (permalink / raw)
To: Colin King; +Cc: alsa-devel, Jaroslav Kysela, kernel-janitors, linux-kernel
On Thu, 27 Jun 2019 18:43:08 +0200,
Colin King wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> There are a couple of left shifts of unsigned 8 bit values that
> first get promoted to signed ints and hence get sign extended
> on the shift if the top bit of the 8 bit values are set. Fix
> this by casting the 8 bit values to unsigned ints to stop the
> unintentional sign extension.
>
> Addresses-Coverity: ("Unintended sign extension")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Applied now. Thanks.
Takashi
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-06-28 8:38 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-27 16:43 [PATCH] ALSA: usb-audio: fix sign unintended sign extension on left shifts Colin King
2019-06-27 16:43 ` Colin King
2019-06-28 8:37 ` Takashi Iwai
2019-06-28 8:37 ` Takashi Iwai
2019-06-28 8:37 ` Takashi Iwai
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