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

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Message-ID: <20250119010509.2052-1-hdanton@sina.com>
Date: Sun, 19 Jan 2025 09:05:07 +0800
From: Hillf Danton <hdanton@...a.com>
To: syzbot <syzbot+1eb177ecc3943b883f0a@...kaller.appspotmail.com>
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [media?] KASAN: slab-use-after-free Read in dvb_device_open

On Sat, 18 Jan 2025 11:50:29 -0800
> syzbot has found a reproducer for the following issue on:
> 
> HEAD commit:    595523945be0 Merge tag 'devicetree-fixes-for-6.13-2' of gi..
> git tree:       upstream
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12183fc4580000

#syz test

--- x/drivers/media/dvb-core/dvb_frontend.c
+++ y/drivers/media/dvb-core/dvb_frontend.c
@@ -2887,6 +2887,7 @@ err3:
 	mutex_unlock(&fe->dvb->mdev_lock);
 err2:
 #endif
+	dvb_device_get(dvbdev);
 	dvb_generic_release(inode, file);
 err1:
 	if (dvbdev->users == -1 && fe->ops.ts_bus_ctrl)
--