linux-kernel - Re: [syzbot] [media?] KASAN: slab-use-after-free Read in em28xx_release

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Message-ID: <20260110032206.2102-1-hdanton@sina.com>
Date: Sat, 10 Jan 2026 11:22:05 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+16062f26c6480975e5ed@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [media?] KASAN: slab-use-after-free Read in em28xx_release_resources

> Date: Thu, 08 Jan 2026 20:22:24 -0800
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    79b95d74470d Merge tag 'hid-for-linus-2026010801' of git:/..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=112b219a580000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a94030c847137a18
> dashboard link: https://syzkaller.appspot.com/bug?extid=16062f26c6480975e5ed
> compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=152b219a580000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13e6e922580000

#syz test

--- x/drivers/media/usb/em28xx/em28xx-video.c
+++ y/drivers/media/usb/em28xx/em28xx-video.c
@@ -2898,6 +2898,7 @@ unregister_dev:
 	v4l2_device_unregister(&v4l2->v4l2_dev);
 err:
 	dev->v4l2 = NULL;
+	em28xx_v4l2_media_release(dev);
 	kref_put(&v4l2->ref, em28xx_free_v4l2);
 	mutex_unlock(&dev->lock);
 	return ret;
--