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ALSA: usb-audio: Fix undefined behavior due to shift overflowing the constant

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[ 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@suse.de>
Link: https://lore.kernel.org/r/20220405151517.29753-3-bp@alien8.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Borislav Petkov 2022-04-05 17:15:08 +02:00 committed by Greg Kroah-Hartman
parent 490815f0b5
commit cd227ac03f
1 changed files with 1 additions and 1 deletions
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2
sound/usb/usbaudio.h
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@ -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))