From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37404C433F5 for ; Mon, 25 Apr 2022 16:56:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239754AbiDYQ7B (ORCPT ); Mon, 25 Apr 2022 12:59:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43924 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231520AbiDYQ7A (ORCPT ); Mon, 25 Apr 2022 12:59:00 -0400 Received: from mail-pj1-x1032.google.com (mail-pj1-x1032.google.com [IPv6:2607:f8b0:4864:20::1032]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0116D15727 for ; Mon, 25 Apr 2022 09:55:55 -0700 (PDT) Received: by mail-pj1-x1032.google.com with SMTP id iq2-20020a17090afb4200b001d93cf33ae9so504712pjb.5 for ; Mon, 25 Apr 2022 09:55:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=fHj0AXFpbHX+x5jOd8SRt9e16ihhUng0D/feKZZnpv8=; b=FEvSxjhbaiBv88L8kOktym3iC8R8O3qQefPdoXOLlesqLA7PHFDH4Ly1WACA+rAmHU WFYWAsFAgO9K4ek0AIY1Py4MA2xes8OeKQTniMnqopB4OUBWhSYZyycRYIIrrO66eF+q TezSS9rHfXn8M6biPzALcA8etR6djyTk3IYCFtRAc6AtM9o311inxeF5QVFsv9YOJdtQ Iav/UtTiNPUp3qqSJW9SDbHTJ8n7Qn1kEQ7qIAsed4W8ZdZMYBKJuCxFSbqn3W4cofC3 vxKrxlTxfU0xkOltUvgpDhUIfB2B58Ap/oM5hMcHQAVk2ZVy/hup4ude5BbsD80l9n+2 sAUA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=fHj0AXFpbHX+x5jOd8SRt9e16ihhUng0D/feKZZnpv8=; b=C774qNL1wSyXXfBR9riEAUbygMlAwQ05EnADJQdJmPPHn5jrw9QAHHhMXeVQNJ33gD 1NLxud0w0jjPIgusdNd/WhgOdr55Az/nf2M5ykdxLJ2BgwiTVun7i4YAQSuTJqCudZXe 3QVGzuv9od73mgIfPkNi+lXCb55TBAPoXcfqMb/uH1g2Ij+FhqJfQ+0ELw8YDQpNk3l4 gOF2Y7UZxOGp9t949G05PkdrckmalF1GhvcC+B6URt2ZZKycDe1YcJMDnXfZfycR0LsU 5RUcmFKj9zGZEKBxg6Y3GyyjZprixzog1KIcuhzl+VTBOD8+XJTIi2+yF+LVyCPqEr9g IPVw== X-Gm-Message-State: AOAM533QNp3bZ5hcPFbGQA6cPgMfT/wbNbPkViaFAPurRt2yNL6MawpG vY1l0wQZ/XeXwRcJIH5PGQ8BhJ86WEboZg== X-Google-Smtp-Source: ABdhPJy8UDRi8nvlNJ/DZUcck1tp5UrommAF25tWePBOj8Foc0cM4QAxsDb5oZ1qiqmpv2T1TVm1OQ== X-Received: by 2002:a17:90b:255:b0:1cf:39e7:a7aa with SMTP id fz21-20020a17090b025500b001cf39e7a7aamr22087982pjb.137.1650905755524; Mon, 25 Apr 2022 09:55:55 -0700 (PDT) Received: from p14s (S0106889e681aac74.cg.shawcable.net. [68.147.0.187]) by smtp.gmail.com with ESMTPSA id d20-20020a056a00199400b005060849909esm14038460pfl.176.2022.04.25.09.55.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 Apr 2022 09:55:54 -0700 (PDT) Date: Mon, 25 Apr 2022 10:55:52 -0600 From: Mathieu Poirier To: Hangyu Hua Cc: bjorn.andersson@linaro.org, arnaud.pouliquen@foss.st.com, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] rpmsg: virtio: fix possible double free in rpmsg_probe() Message-ID: <20220425165552.GB1917807@p14s> References: <20220418093144.40859-1-hbh25y@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220418093144.40859-1-hbh25y@gmail.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 18, 2022 at 05:31:44PM +0800, Hangyu Hua wrote: > vch will be free in virtio_rpmsg_release_device() when > rpmsg_ns_register_device() fails. There is no need to call kfree() again. > > Fix this by changing error path from free_vch to free_ctrldev. > > Fixes: c486682ae1e2 ("rpmsg: virtio: Register the rpmsg_char device") > Signed-off-by: Hangyu Hua > --- > drivers/rpmsg/virtio_rpmsg_bus.c | 4 +--- > 1 file changed, 1 insertion(+), 3 deletions(-) > > diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c > index 3ede25b1f2e4..603233f0686e 100644 > --- a/drivers/rpmsg/virtio_rpmsg_bus.c > +++ b/drivers/rpmsg/virtio_rpmsg_bus.c > @@ -973,7 +973,7 @@ static int rpmsg_probe(struct virtio_device *vdev) > > err = rpmsg_ns_register_device(rpdev_ns); > if (err) > - goto free_vch; Please add a comment that highlights where 'vch' will be free'd to avoid receiving patches that will introduce another kfree(). Same for your other patch. In the next revision please use a cover letter and add Arnaud's patches to it. Thanks, Mathieu > + goto free_ctrldev; > } > > /* > @@ -997,8 +997,6 @@ static int rpmsg_probe(struct virtio_device *vdev) > > return 0; > > -free_vch: > - kfree(vch); > free_ctrldev: > rpmsg_virtio_del_ctrl_dev(rpdev_ctrl); > free_coherent: > -- > 2.25.1 >