linux-kernel - Re: [syzbot] [sound?] [usb?] KASAN: slab-out-of-bounds Write in copy_to

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Message-ID: <tencent_87920D5DAC5DCD993ECF8E8DEB25828DC307@qq.com>
Date: Tue, 13 Jan 2026 15:54:05 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+6db0415d6d5c635f72cb@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [sound?] [usb?] KASAN: slab-out-of-bounds Write in copy_to_urb (2)

#syz test

diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 54d01dfd820f..263abb36bb2d 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -1553,7 +1553,7 @@ static int prepare_playback_urb(struct snd_usb_substream *subs,
 
 		for (i = 0; i < ctx->packets; i++) {
 			counts = snd_usb_endpoint_next_packet_size(ep, ctx, i, avail);
-			if (counts < 0)
+			if (counts < 0 || frames + counts >= ep->max_urb_frames)
 				break;
 			/* set up descriptor */
 			urb->iso_frame_desc[i].offset = frames * stride;