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From: Edward Adam Davis <eadavis@qq.com>
To: syzbot+6db0415d6d5c635f72cb@syzkaller.appspotmail.com
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [sound?] [usb?] KASAN: slab-out-of-bounds Write in copy_to_urb (2)
Date: Tue, 13 Jan 2026 15:54:05 +0800	[thread overview]
Message-ID: <tencent_87920D5DAC5DCD993ECF8E8DEB25828DC307@qq.com> (raw)
In-Reply-To: <6965a06e.050a0220.38aacd.0004.GAE@google.com>

#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;


  reply	other threads:[~2026-01-13  7:57 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-01-13  1:31 syzbot
2026-01-13  7:54 ` Edward Adam Davis [this message]
2026-01-13  8:15   ` syzbot
2026-01-13  8:29 ` [PATCH] ALSA: usb-audio: Prevent excessive number of frames Edward Adam Davis
2026-01-13 14:06   ` Takashi Iwai

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