From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792476292; b=v0zyp2LE2vTos7AWodbU7qziUpVpf5p5KLT7bnbdpRsLecp+rQXMA1TFTOYxBACcUTR7 wcO/xaQRr/4S0jdD5DICdMwZG1k0K4DT0mL1bmuQtfy0DCGn0ab+AeG9Wn3lVXVwaGFPA ctjHZ+Ipxhv9P59w9+HhyavIolYmWj+WpXyUKm2JcBcx00dmwh7YN2I1k9KWIfGVOBHUC FFWZGyn0ae3uzEOMhBHfDeZiNKNx783vYMvFHp0zOarLRjA9CzVfAMolskKLOI3o2bifc GDwJyfCHeNQzLBamdnGVzqiTnywqTCsC+3br6R3QPUuxUkdmS8MagkzoGoJ+wibowmg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792476292; h=Received:DKIM-Signature:Date:From:To:Cc:Subject:Message-ID: References:MIME-Version:Content-Type:Content-Disposition:In-Reply-To; bh=rQqFxEC/LlvMiwUar68b8H+DzYLlRZlQd9Usb1HL9CA=; b=S8iQ4kVkd7UBl47EyRxuqT8icxmUT5aicD2/yMyY+fUh/TzPjrXkNNSQWL4OweMVASz1 +ulB1KUL7NiUDbv0VMzV1TGKOKJj+NK0+pYh2ZLVzBG3yj9/JoSthmJMULgOjDrHlAL6c 6ziZcvsE3EmAX4sJFgQXEDUA0HlWNdtAjfmBWmDpqI1GPKg6ynV3z6Eg7lqjn0xfImSfd WlVvzAdazGkagZCkSO7SmOWkIC6c86MGHSb1a+dHJK5z7jVXu/oW0PIUlGWMI4LM6LPWH RzHEnvRWjoUQkkVIyzc0moC+4KJ94fTgWNc8fWRPWidDRFRb1DOhNzhmxsbu9YVui8A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=Zon0lnby; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 960C0606A31C; Tue, 20 Oct 2026 06:04:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=Zon0lnby Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7B1881F000C4; Tue, 20 Oct 2026 06:04:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792476291; bh=rQqFxEC/LlvMiwUar68b8H+DzYLlRZlQd9Usb1HL9CA=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Zon0lnby0Lm4ap+qIbwrlj4VJWZocAJUJeDAlvKvDZ1ewa1tYp4mTlhTphpaE2lTV TR9ImDQ8jfEaq4+PX2FlwKbRHqV3ZTiggnI/F8mj+wz44G3Ct6YcqVrf9DG6VgYCPm qtxbOAH0Wh3Q+kLg1FuTXP9qvP5Q0JuE1CAOtDzY= Date: Tue, 20 Oct 2026 08:04:47 +0200 From: Greg Kroah-Hartman To: Yu Zhang Cc: Mike Christie , "Martin K . Petersen" , linux-usb@vger.kernel.org, target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [BUG] usb: gadget: f_tcm: NULL-ptr-deref / use-after-free when the UDC is disconnected during in-flight target I/O Message-ID: <2026102035-unsure-garland-2281@gregkh> References: <20261020052629.92551-1-yuz08559@gmail.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261020052629.92551-1-yuz08559@gmail.com> On Tue, Oct 20, 2026 at 03:26:29PM +1000, Yu Zhang wrote: > Hi, > > f_tcm frees its per-endpoint USB requests on the teardown path without > waiting for in-flight target_core commands to finish, so a command that > is still being processed by the backend when the gadget is disconnected > completes into freed/NULL request memory. Great, can you submit a patch for this? thanks, greg k-h