From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f70.google.com (mail-ot1-f70.google.com [209.85.210.70]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C74FC1D6BB for ; Wed, 22 Apr 2026 04:50:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.70 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776833408; cv=none; b=gvszhGaEmIUf0RU8kODmbOFdygsACUOA4i38ILgCVF7VqK58SjHkYGxjVc8L3feiU+2WoVdAMUFMHYexEAkpAetDKBXz2bmNbF6HaxrdVDycoxWaKpnngXavCbvf5KbmUGUs62P0nzrk5VtW/VPRvXmV8mF4mUm6BOurbwivSso= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776833408; c=relaxed/simple; bh=klyL4FZ/zaqZaZsaqFw0eAIU8qNZWfFBJFzegNuZ8Ik=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=UBHnf8/EvfpA5+k/nOTd4YshRWtgxHhGdS+BlxIVcfhA95oyGrNeAhNahOdt0etnFR8PWuUoL9z+Wwz3gvVpLK/+NZ9iO1YITFw4iryy5spdZb1vmYwDPUSg+GHd5eiTL+9qoBeVbt740ysUWN4Rg6oP2+sVZUmb7JiqAYulM80= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.70 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f70.google.com with SMTP id 46e09a7af769-7dbd4fe0e15so11521969a34.3 for ; Tue, 21 Apr 2026 21:50:06 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776833406; x=1777438206; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=03QzkTOlqUh5rIEqT3yDmZkEdsJl77RXrHsjb5vkjZo=; b=V/SqxLf6L2zK4vYJXLMBhNPdx13M4AKtW42JQYZSQfZE7WCKQ7pkd/SiRudKQWShoz T0cx/06u7PoY9bhM+9PijUbYARXQp/5zsc8U82aD/DymnOjkWtP0gFw720u+QL+aInkC htjmv2YmTppe10q5o6m2NzglRQ/QBHW7xhHycjfgW9irLwvWkwymkHPSBMkpq/ldrHTd vOQJf4J5xSKI7EHanGoAW/mvog5ssxa8T9TJoyLo9DSaAdtXdBpsEn5iwpjexD8WmZup zeDl2dJrzn/LWtsz0Wplpyw2bI862o5OMn6paRHaPupO24eTdIe9ZmdqQalrm84TML4U spRg== X-Gm-Message-State: AOJu0YzKLYGsP/9wPQu9MklNk1/66vBaAqtInW35S6te2BTQ0isV72cV gMq7U3Ou2nSSXt4dggG27GxHNYpSo3CbRvb/Pag2ZOWqzqDHAPMAUUhV/OX7PXlSXY1sAc68O7Z K0I+/0eUxG23ekDsQIDKTlXqn06b9d0bVeHBP37/5uNz1AsgVhlHvhCJ2UyI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:210e:b0:684:dd1d:5b8f with SMTP id 006d021491bc7-69462bcecb3mr12375606eaf.0.1776833405799; Tue, 21 Apr 2026 21:50:05 -0700 (PDT) Date: Tue, 21 Apr 2026 21:50:05 -0700 In-Reply-To: <69e69c55.050a0220.24bfd3.0029.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69e8537d.a00a0220.9259.0018.GAE@google.com> Subject: Forwarded: [PATCH] media: rtl2832: fix use-after-free in rtl2832_remove() From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: [PATCH] media: rtl2832: fix use-after-free in rtl2832_remove() Author: kartikey406@gmail.com #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master cancel_delayed_work_sync() is called before i2c_mux_del_adapters(), but i2c_mux_del_adapters() internally performs I2C transfers which trigger rtl2832_deselect(), which reschedules i2c_gate_work via schedule_delayed_work(). This re-arms the timer after it has been cancelled, causing a use-after-free when kfree(dev) is called and the timer later fires on freed memory. Fix this by calling i2c_mux_del_adapters() before cancel_delayed_work_sync(). Once i2c_mux_del_adapters() completes, no further I2C transfers can go through the mux, so rtl2832_deselect() can never re-arm the timer again, making the cancellation truly final. Reported-by: syzbot+019ced393ab913002b75@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=019ced393ab913002b75 Signed-off-by: Deepanshu Kartikey --- drivers/media/dvb-frontends/rtl2832.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/media/dvb-frontends/rtl2832.c b/drivers/media/dvb-frontends/rtl2832.c index d8e1546aea5e..9898f729304a 100644 --- a/drivers/media/dvb-frontends/rtl2832.c +++ b/drivers/media/dvb-frontends/rtl2832.c @@ -1115,10 +1115,10 @@ static void rtl2832_remove(struct i2c_client *client) dev_dbg(&client->dev, "\n"); - cancel_delayed_work_sync(&dev->i2c_gate_work); - i2c_mux_del_adapters(dev->muxc); + cancel_delayed_work_sync(&dev->i2c_gate_work); + regmap_exit(dev->regmap); kfree(dev); -- 2.43.0