linux-kernel - [PATCH 5.4 26/62] ALSA: usb-audio: Fix undefined behavior due to shift overflowing the constant

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Message-Id: <20220426081737.977121538@linuxfoundation.org>
Date:   Tue, 26 Apr 2022 10:21:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Borislav Petkov <bp@...e.de>,
        Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 26/62] ALSA: usb-audio: Fix undefined behavior due to shift overflowing the constant

From: Borislav Petkov <bp@...e.de>

[ Upstream commit 1ef8715975de8bd481abbd0839ed4f49d9e5b0ff ]

Fix:

  sound/usb/midi.c: In function ‘snd_usbmidi_out_endpoint_create’:
  sound/usb/midi.c:1389:2: error: case label does not reduce to an integer constant
    case USB_ID(0xfc08, 0x0101): /* Unknown vendor Cable */
    ^~~~

See https://lore.kernel.org/r/YkwQ6%2BtIH8GQpuct@zn.tnic for the gory
details as to why it triggers with older gccs only.

[ A slight correction with parentheses around the argument by tiwai ]

Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lore.kernel.org/r/20220405151517.29753-3-bp@alien8.de
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/usb/usbaudio.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index ff97fdcf63bd..b1959e04cbb1 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -8,7 +8,7 @@
  */
 
 /* handling of USB vendor/product ID pairs as 32-bit numbers */
-#define USB_ID(vendor, product) (((vendor) << 16) | (product))
+#define USB_ID(vendor, product) (((unsigned int)(vendor) << 16) | (product))
 #define USB_ID_VENDOR(id) ((id) >> 16)
 #define USB_ID_PRODUCT(id) ((u16)(id))
 
-- 
2.35.1