Patch "ALSA: usb: Fix UBSAN warning in parse_audio_unit()" has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    ALSA: usb: Fix UBSAN warning in parse_audio_unit()

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     alsa-usb-fix-ubsan-warning-in-parse_audio_unit.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit c64b7784ad9294a6c683f442cbabe1b3216b8004
Author: Takashi Iwai <tiwai@xxxxxxx>
Date:   Mon Jul 15 14:35:54 2024 +0200

    ALSA: usb: Fix UBSAN warning in parse_audio_unit()
    
    [ Upstream commit 2f38cf730caedaeacdefb7ff35b0a3c1168117f9 ]
    
    A malformed USB descriptor may pass the lengthy mixer description with
    a lot of channels, and this may overflow the 32bit integer shift
    size, as caught by syzbot UBSAN test.  Although this won't cause any
    real trouble, it's better to address.
    
    This patch introduces a sanity check of the number of channels to bail
    out the parsing when too many channels are found.
    
    Reported-by: syzbot+78d5b129a762182225aa@xxxxxxxxxxxxxxxxxxxxxxxxx
    Closes: https://lore.kernel.org/0000000000000adac5061d3c7355@xxxxxxxxxx
    Link: https://patch.msgid.link/20240715123619.26612-1-tiwai@xxxxxxx
    Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 5699a62d17679..34ded71cb8077 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -2023,6 +2023,13 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
 		bmaControls = ftr->bmaControls;
 	}
 
+	if (channels > 32) {
+		usb_audio_info(state->chip,
+			       "usbmixer: too many channels (%d) in unit %d\n",
+			       channels, unitid);
+		return -EINVAL;
+	}
+
 	/* parse the source unit */
 	err = parse_audio_unit(state, hdr->bSourceID);
 	if (err < 0)




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