From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 471C73009C1 for ; Fri, 30 Jan 2026 08:03:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769760205; cv=none; b=VTskdu1YUTg07QSQfxqUqwcT+/i92W8EeRTjgw0RFI8dVvotvGnTw/lrdsmeWz+J+vP+XxzL8Pv+3zklNiM1SpBIGdMj3YW9EXhwI7EjX8RPbBmBOZzEcTxQb9NVgRbqfI5UT3thP/hUomzKEUmvPBN8DY/ntlqLuwk98fpfvOY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769760205; c=relaxed/simple; bh=0vvxTNZtE9blyRKG0QmjEm3MA7AMELs2r+SaJOTZApY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=XP1SC9afOVmnDL7IASHanGMKmwGYJkzM29+F7X56JzcWX+1OPA6PxMf99Z2W8OamvbmhXlTwuLuVydiEwtd5HXlTUs1nQVCL3WXGLe/wy6YrG9xy9JYWfNfWB/69YtIV4Igyqpnql4zpiPFa3mWkLn5IgX1NnoE1xyWrnHKYyNs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=OSFyat/p; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OSFyat/p" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1769760203; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=DDnkjCbXpYisumYmIRFHtNeXXpB5IUbbsMXbRBwy7X8=; b=OSFyat/pnx7c1PF80Xk6+v4OXKYDsCGZxdMb99NTtJJgqcGFG2CevTebF1pmyGB5feQaQt cJl6BBCzEAQ6tkTFrbWuA7Q8lbIM7OuEjNss/A+0CozOI4wokyG8Mzdrc/RC1D0xeBdKzO WyJcd01aGY/wviSEW9nkhGj3IAqjPpo= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-449-lvTeQqykMEab-ZUErJU9zg-1; Fri, 30 Jan 2026 03:03:20 -0500 X-MC-Unique: lvTeQqykMEab-ZUErJU9zg-1 X-Mimecast-MFC-AGG-ID: lvTeQqykMEab-ZUErJU9zg_1769760199 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 5F38E19560B2; Fri, 30 Jan 2026 08:03:19 +0000 (UTC) Received: from fedora (unknown [10.72.116.182]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4FEEB19560A2; Fri, 30 Jan 2026 08:03:14 +0000 (UTC) Date: Fri, 30 Jan 2026 16:03:09 +0800 From: Ming Lei To: Caleb Sander Mateos Cc: Jens Axboe , Govindarajulu Varadarajan , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/4] ublk: Validate SQE128 flag before accessing the cmd Message-ID: References: <20260129224618.975401-1-csander@purestorage.com> <20260129224618.975401-2-csander@purestorage.com> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260129224618.975401-2-csander@purestorage.com> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 On Thu, Jan 29, 2026 at 03:46:14PM -0700, Caleb Sander Mateos wrote: > From: Govindarajulu Varadarajan > > ublk_ctrl_cmd_dump() accesses (header *)sqe->cmd before > IO_URING_F_SQE128 flag check. This could cause out of boundary memory > access. > > Move the SQE128 flag check earlier in ublk_ctrl_uring_cmd() to return > -EINVAL immediately if the flag is not set. > > Fixes: 71f28f3136af ("ublk_drv: add io_uring based userspace block driver") > Signed-off-by: Govindarajulu Varadarajan > Reviewed-by: Caleb Sander Mateos Reviewed-by: Ming Lei Thanks, Ming