[PATCH 5.16 054/126] ALSA: usb-audio: initialize variables that could ignore errors

Greg Kroah-Hartman
2022-02-07T12:00:13Z

From: Tom Rix <trix@redhat.com>

commit 3da4b7403db87d39bc2613cfd790de1de99a70ab upstream.

clang static analysis reports this representative issue
mixer.c:1548:35: warning: Assigned value is garbage or undefined
ucontrol->value.integer.value[0] = val;
^ ~~~

The filter_error() macro allows errors to be ignored.
If errors can be ignored, initialize variables
so garbage will not be used.

Fixes: 48cc42973509 ("ALSA: usb-audio: Filter error from connector kctl ops, too")
Signed-off-by: Tom Rix <trix@redhat.com>
Link: https://lore.kernel.org/r/20220126182142.1184819-1-trix@redhat.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
sound/usb/mixer.c | 4 ++++
1 file changed, 4 insertions(+)

--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1526,6 +1526,10 @@ error:
usb_audio_err(chip,
"cannot get connectors status: req = %#x, wValue = %#x, wIndex = %#x, type = %d\n",
UAC_GET_CUR, validx, idx, cval->val_type);
+
+ if (val)
+ *val = 0;
+
return filter_error(cval, ret);
}