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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 EE051C76195 for ; Mon, 15 Jul 2019 14:18:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BA8E82182B for ; Mon, 15 Jul 2019 14:18:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563200317; bh=L+rBLsU0eTw6Z4CMA658MU7OvvvcaxUg30vK9kB/r1w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=gZAnra7uKjPthM+ntXPiySmRep4uJu0sMH+BdxBbKolp9/jtYmbk1su6bYSkpw2XJ gPEjFWxsofORuwE09LPCPG0Gzu2GjyySXn3Xk1WFJ5cXWOylglalg4X3uWJ0D3f2A/ 8O7hc4SEC/5yQ2AycF6Gc0tLsJqNf06+5m6QlVwA= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389953AbfGOOSh (ORCPT ); Mon, 15 Jul 2019 10:18:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:38854 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389011AbfGOOSg (ORCPT ); Mon, 15 Jul 2019 10:18:36 -0400 Received: from sasha-vm.mshome.net (unknown [73.61.17.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 358C220868; Mon, 15 Jul 2019 14:18:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563200316; bh=L+rBLsU0eTw6Z4CMA658MU7OvvvcaxUg30vK9kB/r1w=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=h8yPotMct9mjuIsHUutawl4WSnboFvOMK14HTfPpn5wwSwEhM2zbBMzUf5plPNxpI vSw0OK+dEj9fiAmejI5z3LwhfbT7pLKohJZAwrRjIPkpLaeBQwRMg4+uho/vatH85Y z7wUhUwFRVo2RcqsCVBfJisWPapLND5vuFzUZ36M= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Daniel Baluta , Stefan Wahren , Mark Brown , Sasha Levin Subject: [PATCH AUTOSEL 4.19 009/158] regmap: debugfs: Fix memory leak in regmap_debugfs_init Date: Mon, 15 Jul 2019 10:15:40 -0400 Message-Id: <20190715141809.8445-9-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190715141809.8445-1-sashal@kernel.org> References: <20190715141809.8445-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Daniel Baluta [ Upstream commit 2899872b627e99b7586fe3b6c9f861da1b4d5072 ] As detected by kmemleak running on i.MX6ULL board: nreferenced object 0xd8366600 (size 64): comm "swapper/0", pid 1, jiffies 4294937370 (age 933.220s) hex dump (first 32 bytes): 64 75 6d 6d 79 2d 69 6f 6d 75 78 63 2d 67 70 72 dummy-iomuxc-gpr 40 32 30 65 34 30 30 30 00 e3 f3 ab fe d1 1b dd @20e4000........ backtrace: [] kasprintf+0x2c/0x54 [] regmap_debugfs_init+0x7c/0x31c [<9c8d91fa>] __regmap_init+0xb5c/0xcf4 [<5b1c3d2a>] of_syscon_register+0x164/0x2c4 [<596a5d80>] syscon_node_to_regmap+0x64/0x90 [<49bd597b>] imx6ul_init_machine+0x34/0xa0 [<250a4dac>] customize_machine+0x1c/0x30 [<2d19fdaf>] do_one_initcall+0x7c/0x398 [] kernel_init_freeable+0x328/0x448 [<168c9101>] kernel_init+0x8/0x114 [<913268aa>] ret_from_fork+0x14/0x20 [] 0x0 Root cause is that map->debugfs_name is allocated using kasprintf and then the pointer is lost by assigning it other memory address. Reported-by: Stefan Wahren Signed-off-by: Daniel Baluta Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- drivers/base/regmap/regmap-debugfs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c index 87b562e49a43..c9687c8b2347 100644 --- a/drivers/base/regmap/regmap-debugfs.c +++ b/drivers/base/regmap/regmap-debugfs.c @@ -575,6 +575,8 @@ void regmap_debugfs_init(struct regmap *map, const char *name) } if (!strcmp(name, "dummy")) { + kfree(map->debugfs_name); + map->debugfs_name = kasprintf(GFP_KERNEL, "dummy%d", dummy_index); name = map->debugfs_name; -- 2.20.1