Messages in this thread Patch in this message | | | From | Colin King <> | Subject | [PATCH] ALSA: usb-audio: fix sign unintended sign extension on left shifts | Date | Thu, 27 Jun 2019 17:43:08 +0100 |
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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
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