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 8D5E7C25B0C for ; Thu, 11 Aug 2022 16:18:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237642AbiHKQS4 (ORCPT ); Thu, 11 Aug 2022 12:18:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235855AbiHKQSJ (ORCPT ); Thu, 11 Aug 2022 12:18:09 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 60845B5B; Thu, 11 Aug 2022 09:00:23 -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 D335CB82171; Thu, 11 Aug 2022 16:00:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3509AC433C1; Thu, 11 Aug 2022 16:00:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1660233620; bh=oZWFbqsYU51GBX3H8pj0TGj/dFXXJUNLq0o3X1U9pIg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oTB6uboJMZ54vl34mNuMPn/sMQVqmOT1JcTHj3gyQmc25o6NWAhvjlhV+lzKhl7S/ P5iNXLsYGi8Hg5I9oLkdYQc+rkLJ3m0Si8gP/RitHmA8CxbGN0v4mnLeXCybGp1RqN h3ZCKOyVjiiFO49hdRWkjFctugAdUOiqnwRJx7+4Et6oVrPYl+JIOZsKkTxA+wc2l4 j1PKpgWS+/ck8lr2YCisc4EeVGiIqrkuJF+Bu8OxAsMwfF1xoJ6WjoUxTyL+v3K+A3 Ypcoz7nJrwMwuu/a3MDZFQP9gH839UlCikNGRFeyz3hFVKsBekfdQR7JHelH6B083E b0krPjHpkB2+A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Zqiang , "Paul E . McKenney" , Sasha Levin , dave@stgolabs.net, josh@joshtriplett.org, frederic@kernel.org, quic_neeraju@quicinc.com, rcu@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 32/69] rcutorture: Fix memory leak in rcu_test_debug_objects() Date: Thu, 11 Aug 2022 11:55:41 -0400 Message-Id: <20220811155632.1536867-32-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220811155632.1536867-1-sashal@kernel.org> References: <20220811155632.1536867-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zqiang [ Upstream commit 98ea20328786372cbbc90c601be168f5fe1f8845 ] The kernel memory leak detector located the following: unreferenced object 0xffff95d941135b50 (size 16): comm "swapper/0", pid 1, jiffies 4294667610 (age 1367.451s) hex dump (first 16 bytes): f0 c6 c2 bd d9 95 ff ff 00 00 00 00 00 00 00 00 ................ backtrace: [<00000000bc81d9b1>] kmem_cache_alloc_trace+0x2f6/0x500 [<00000000d28be229>] rcu_torture_init+0x1235/0x1354 [<0000000032c3acd9>] do_one_initcall+0x51/0x210 [<000000003c117727>] kernel_init_freeable+0x205/0x259 [<000000003961f965>] kernel_init+0x1a/0x120 [<000000001998f890>] ret_from_fork+0x22/0x30 This is caused by the rcu_test_debug_objects() function allocating an rcu_head structure, then failing to free it. This commit therefore adds the needed kfree() after the last use of this structure. Signed-off-by: Zqiang Signed-off-by: Paul E. McKenney Signed-off-by: Sasha Levin --- kernel/rcu/rcutorture.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index f922937eb39a..247a3face573 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2957,6 +2957,7 @@ static void rcu_test_debug_objects(void) pr_alert("%s: WARN: Duplicate call_rcu() test complete.\n", KBUILD_MODNAME); destroy_rcu_head_on_stack(&rh1); destroy_rcu_head_on_stack(&rh2); + kfree(rhp); #else /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ pr_alert("%s: !CONFIG_DEBUG_OBJECTS_RCU_HEAD, not testing duplicate call_rcu()\n", KBUILD_MODNAME); #endif /* #else #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */ -- 2.35.1