linux-kernel - Re: [syzbot] [sound?] [usb?] UBSAN: shift-out-of-bounds in parse_audio

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Message-ID: <tencent_9FA26F1C2CBD6D889734E986EDE6CDC47A0A@qq.com>
Date: Tue, 16 Jul 2024 15:05:33 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+78d5b129a762182225aa@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [sound?] [usb?] UBSAN: shift-out-of-bounds in parse_audio_unit

bLength too small ?

#syz test: upstream a19ea421490d

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 409fc1164694..cc92c989a772 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1999,6 +1999,9 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
 
 	if (state->mixer->protocol == UAC_VERSION_1) {
 		csize = hdr->bControlSize;
+		printk("c: %d, bLen: %d, %c, \n", channels, hdr->bLength, hdr->bLength, __func__ );
+		if (hdr->bLength < 7)
+			return -EINVAL;
 		channels = (hdr->bLength - 7) / csize - 1;
 		bmaControls = hdr->bmaControls;
 	} else if (state->mixer->protocol == UAC_VERSION_2) {