[PATCH AUTOSEL 4.19 5/9] ALSA: usb-audio: Fix an out-of-bounds bug in __snd_usb_parse_audio_interface()

[Sasha Levin <sashal@kernel.org>]

From: Dongxiang Ke <kdx.glider@gmail.com>

[ Upstream commit e53f47f6c1a56d2af728909f1cb894da6b43d9bf ]

There may be a bad USB audio device with a USB ID of (0x04fa, 0x4201) and
the number of it's interfaces less than 4, an out-of-bounds read bug occurs
when parsing the interface descriptor for this device.

Fix this by checking the number of interfaces.

Signed-off-by: Dongxiang Ke <kdx.glider@gmail.com>
Link: https://lore.kernel.org/r/20220906024928.10951-1-kdx.glider@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/usb/stream.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 9a950aaf5e356..1cfb30465df7d 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -1111,7 +1111,7 @@ int snd_usb_parse_audio_interface(struct snd_usb_audio *chip, int iface_no)
 	 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
 	 * one misses syncpipe, and does not produce any sound.
 	 */
-	if (chip->usb_id == USB_ID(0x04fa, 0x4201))
+	if (chip->usb_id == USB_ID(0x04fa, 0x4201) && num >= 4)
 		num = 4;
 
 	for (i = 0; i < num; i++) {
-- 
2.35.1