ALSA: usb-audio: initialize variables that could ignore errors

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>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 8e030b1..5675148 100644 (file)
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1496,6 +1496,10 @@ 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);
        }