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 20EFD35E94E for ; Sun, 10 May 2026 07:24:39 +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=1778397881; cv=none; b=CPXo9e59cnEfZLnxFVKxddmJJ3nWoYGaTEzsCLX1lKpCGAi4ZMFFEgqYP+ibaHVqYq+GxiRL8bRi4e/bAPzslxvUOocysZ46vCAYtSBjRfm8JHo1FFzshy2BoDvGcGZC1IF15xgGfEUzKWunON8GWzsXx/paagbGfLpSAgzjr40= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778397881; c=relaxed/simple; bh=s+n+7oum+CK460mi1w+VdmYHCLlPwTP0WmQ9ThzVhJw=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=Hwh7dxZOogeMvHEeJmWPxPDxw0lSSTgd/DwuYXDctgV1CYkZ8R6s0DZAeK2l8tnSOzCNiRC4uKp+kS1Fvg2d9PWxrEhi2IUBDE1cFD7vkfYnMF/CmXk89aEGPDVr/6EiCEiJQJpprkoFnPcpNVbGQUkKevAmj5jyw10uBVLb+Qc= 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 46e09a7af769-7dcd9f8dbe2so5110745a34.1 for ; Sun, 10 May 2026 00:24:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1778397879; x=1779002679; h=cc: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=AnYGhFnm99IjX8YittGtOEKinHV6HIFzFrbpVeVez1s=; b=XD3AAsygO0fS0P+XXcSpvtgai60I2pQmID+4VXQFrWtUC29ptdKft/2O2tzFiXPjd9 SDFIGl5+mOU3v3XZ4U2hRu5ym8xj7tzn5MnCxHH296qqonMCRhKfCcexY664TlJmkOsW 7R7Cwt4jRwYQMjn9x7pGw4vAkrNpBcQkX+Zfm8vH0cZy8v0XMXKlm+JKv9RvKi1RIsnB x+qu4s62RZS0n2jgiw3O57MZjYtkLx6h+lZ/cc+HtdL7eb6zBbLg6qCtgNu2ha1seON9 VNJwCvIoRFrQED5vCNDddoOLSSv+/DnPO2tmiM354yQ84dO0i1ZePNBxeEm2FRR0jH/5 dgow== X-Gm-Message-State: AOJu0Ywk5k+MfIwAOL+W0zJV68pCnHeIqlchLiJ1mQSqX3uKgNS1j6OJ LWAR/d2LhQNg1Y+DUYQ1SEnxPjmvNILGB/AEa7jhTD7OKV9VpYv96RgsQAMcgmhnw7laDtr+nL7 a9/c4/Q3GFIqnBU2R4TWumn1FARctESgTrUVPDbPYw4ryydbF1ZoQi3NCQhc= Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:2017:b0:696:22dc:b4c5 with SMTP id 006d021491bc7-69998cc4e9emr10281027eaf.17.1778397879180; Sun, 10 May 2026 00:24:39 -0700 (PDT) Date: Sun, 10 May 2026 00:24:39 -0700 In-Reply-To: <20260510072418.38636-1-mokshpanicker.7@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a0032b7.050a0220.103c44.0003.GAE@google.com> Subject: Re: [PATCH] media: mxl111sf: fix null pointer dereference in mxl111sf_ctrl_msg From: syzbot To: mokshpanicker.7@gmail.com Cc: linux-media@vger.kernel.org, mchehab@kernel.org, mokshpanicker.7@gmail.com Content-Type: text/plain; charset="UTF-8" > When mxl111sf_ctrl_msg() is called during early probe, state->d > may not yet be initialized, causing a null pointer dereference in > dvb_usbv2_generic_write() when it accesses d->usb_mutex. > > Add a null check for d before proceeding with the USB transfer. > > Fixes: d90b336f3f65 ("[media] mxl111sf: Fix driver to use heap allocate buffers for USB messages") > Reported-by: syzbot+f9f333782a8f54509322@syzkaller.appspotmail.com > Closes: https://syzkaller.appspot.com/bug?extid=f9f333782a8f54509322 > Signed-off-by: Moksh Panicker > --- > drivers/media/usb/dvb-usb-v2/mxl111sf.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/media/usb/dvb-usb-v2/mxl111sf.c b/drivers/media/usb/dvb-usb-v2/mxl111sf.c > index 870ac3c8b085..9908675c355e 100644 > --- a/drivers/media/usb/dvb-usb-v2/mxl111sf.c > +++ b/drivers/media/usb/dvb-usb-v2/mxl111sf.c > @@ -56,6 +56,9 @@ int mxl111sf_ctrl_msg(struct mxl111sf_state *state, > int wo = (rbuf == NULL || rlen == 0); /* write-only */ > int ret; > > + if (!d) > + return -ENODEV; > + > if (1 + wlen > MXL_MAX_XFER_SIZE) { > pr_warn("%s: len=%d is too big!\n", __func__, wlen); > return -EOPNOTSUPP; > -- > 2.34.1 > I see the command but can't find the corresponding bug. The email is sent to syzbot+HASH@syzkaller.appspotmail.com address but the HASH does not correspond to any known bug. Please double check the address.