From patchwork Tue Sep 13 14:03:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 12974845 X-Patchwork-Delegate: kuba@kernel.org 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 2DC6FC6FA89 for ; Tue, 13 Sep 2022 14:27:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233592AbiIMO1R (ORCPT ); Tue, 13 Sep 2022 10:27:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233588AbiIMO0n (ORCPT ); Tue, 13 Sep 2022 10:26:43 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B1C2C5D110; Tue, 13 Sep 2022 07:16:47 -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 14EEDB80F4B; Tue, 13 Sep 2022 14:16:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4D233C433D6; Tue, 13 Sep 2022 14:16:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1663078605; bh=wgRZma+e4X5kCGxfMKh1BxeU5ur5lm00SFY+zuuMEMI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=izy8OIRx+TI9ke3U2TtO03aLiVAg9ptMAlSlleKZTlJDJWvLsqmjCAK5hUttOZRck JiK4JJieerqw72iG3jvEmt+pT5DjQ7xE1ewXE/4ZEyO2owGhOnyTyLnQuMqvyw2k43 xcupUdzmzTQVjA9J+QfaKFzyO1nkreVvqapy4dlw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marcin Wojtas , Russell King , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, stable Subject: [PATCH 5.15 005/121] net: mvpp2: debugfs: fix memory leak when using debugfs_lookup() Date: Tue, 13 Sep 2022 16:03:16 +0200 Message-Id: <20220913140357.557975060@linuxfoundation.org> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20220913140357.323297659@linuxfoundation.org> References: <20220913140357.323297659@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Greg Kroah-Hartman commit fe2c9c61f668cde28dac2b188028c5299cedcc1e upstream. When calling debugfs_lookup() the result must have dput() called on it, otherwise the memory will leak over time. Fix this up to be much simpler logic and only create the root debugfs directory once when the driver is first accessed. That resolves the memory leak and makes things more obvious as to what the intent is. Cc: Marcin Wojtas Cc: Russell King Cc: "David S. Miller" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: netdev@vger.kernel.org Cc: stable Fixes: 21da57a23125 ("net: mvpp2: add a debugfs interface for the Header Parser") Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_debugfs.c @@ -700,10 +700,10 @@ void mvpp2_dbgfs_cleanup(struct mvpp2 *p void mvpp2_dbgfs_init(struct mvpp2 *priv, const char *name) { - struct dentry *mvpp2_dir, *mvpp2_root; + static struct dentry *mvpp2_root; + struct dentry *mvpp2_dir; int ret, i; - mvpp2_root = debugfs_lookup(MVPP2_DRIVER_NAME, NULL); if (!mvpp2_root) mvpp2_root = debugfs_create_dir(MVPP2_DRIVER_NAME, NULL);