From patchwork Tue Apr 5 07:18:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 12801392 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 7E7EFC47080 for ; Tue, 5 Apr 2022 10:27:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241127AbiDEKTC (ORCPT ); Tue, 5 Apr 2022 06:19:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40738 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238977AbiDEJdP (ORCPT ); Tue, 5 Apr 2022 05:33:15 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AEFC2A18D; Tue, 5 Apr 2022 02:21:24 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 58047B81C6F; Tue, 5 Apr 2022 09:21:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 84661C385A0; Tue, 5 Apr 2022 09:21:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649150482; bh=k04tRHaCCcaSw16B5b4zqxD/SIoqsMzrPWW5b4SpaUY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IP4bCE9FnGR3XmotdqsNUhA9O5AVLjTdJXYUF2LeubYjr2BzCH0UocCxNjBY3RAKR rOhxtjQvs6a7ZZtTaGJZOWFa0qWDmSFK+KWGoXvlk3KfHPbCIS4fQfWRjbU+AM33GO 0sesI49MJsNkUdbOTsURO2skeods9o4fKZdqymzk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alistair Delva , Rishabh Bhatnagar , Ohad Ben-Cohen , Bjorn Andersson , Mathieu Poirier , Sibi Sankar , linux-remoteproc@vger.kernel.org, kernel-team@android.com Subject: [PATCH 5.15 070/913] remoteproc: Fix count check in rproc_coredump_write() Date: Tue, 5 Apr 2022 09:18:52 +0200 Message-Id: <20220405070341.922619068@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070339.801210740@linuxfoundation.org> References: <20220405070339.801210740@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org From: Alistair Delva commit f89672cc3681952f2d06314981a6b45f8b0045d1 upstream. Check count for 0, to avoid a potential underflow. Make the check the same as the one in rproc_recovery_write(). Fixes: 3afdc59e4390 ("remoteproc: Add coredump debugfs entry") Signed-off-by: Alistair Delva Cc: Rishabh Bhatnagar Cc: stable@vger.kernel.org Cc: Ohad Ben-Cohen Cc: Bjorn Andersson Cc: Mathieu Poirier Cc: Sibi Sankar Cc: linux-remoteproc@vger.kernel.org Cc: kernel-team@android.com Reviewed-by: Bjorn Andersson Signed-off-by: Bjorn Andersson Link: https://lore.kernel.org/r/20220119232139.1125908-1-adelva@google.com Signed-off-by: Greg Kroah-Hartman --- drivers/remoteproc/remoteproc_debugfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/remoteproc/remoteproc_debugfs.c +++ b/drivers/remoteproc/remoteproc_debugfs.c @@ -76,7 +76,7 @@ static ssize_t rproc_coredump_write(stru int ret, err = 0; char buf[20]; - if (count > sizeof(buf)) + if (count < 1 || count > sizeof(buf)) return -EINVAL; ret = copy_from_user(buf, user_buf, count);