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 X-Spam-Level: X-Spam-Status: No, score=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 71DFAC43462 for ; Mon, 10 May 2021 12:37:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D73761075 for ; Mon, 10 May 2021 12:37:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346649AbhEJMcJ (ORCPT ); Mon, 10 May 2021 08:32:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:49986 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237202AbhEJLLe (ORCPT ); Mon, 10 May 2021 07:11:34 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6FC7F613C9; Mon, 10 May 2021 11:08:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620644888; bh=TbnfRyrVPiZhBN1/T3YrOQ5IbnGguP1qyaLCMaCnOYc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qkk+QAuljucJwucaRUvOfEI5q1wxZOnNCqj3JmIz+gU8rzlc10FlD8UF1Ga4vVSka fSBPVMMr/crg5BgzPyDkr+eMVAIwjVTrFrA+PesShQ/Y3sXAZcmvOWItOQndbEms6W 8mbnofyApC3GgCZ4BUMRNcEMb6gu4KDSpZm5wPt8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Hulk Robot , Yang Yingliang , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 5.12 231/384] media: i2c: adv7511-v4l2: fix possible use-after-free in adv7511_remove() Date: Mon, 10 May 2021 12:20:20 +0200 Message-Id: <20210510102022.510898044@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210510102014.849075526@linuxfoundation.org> References: <20210510102014.849075526@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yang Yingliang [ Upstream commit 2c9541720c66899adf6f3600984cf3ef151295ad ] This driver's remove path calls cancel_delayed_work(). However, that function does not wait until the work function finishes. This means that the callback function may still be running after the driver's remove function has finished, which would result in a use-after-free. Fix by calling cancel_delayed_work_sync(), which ensures that the work is properly cancelled, no longer running, and unable to re-schedule itself. Reported-by: Hulk Robot Signed-off-by: Yang Yingliang Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/i2c/adv7511-v4l2.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/i2c/adv7511-v4l2.c b/drivers/media/i2c/adv7511-v4l2.c index a3161d709015..ab7883cff8b2 100644 --- a/drivers/media/i2c/adv7511-v4l2.c +++ b/drivers/media/i2c/adv7511-v4l2.c @@ -1964,7 +1964,7 @@ static int adv7511_remove(struct i2c_client *client) adv7511_set_isr(sd, false); adv7511_init_setup(sd); - cancel_delayed_work(&state->edid_handler); + cancel_delayed_work_sync(&state->edid_handler); i2c_unregister_device(state->i2c_edid); i2c_unregister_device(state->i2c_cec); i2c_unregister_device(state->i2c_pktmem); -- 2.30.2