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[2620:137:e000::1:20]) by mx.google.com with ESMTP id s16-20020aa7d790000000b005002aad5850si33811530edq.589.2023.03.30.07.12.42; Thu, 30 Mar 2023 07:13:07 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@efficios.com header.s=smtpout1 header.b=P4hVo2EZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=efficios.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230476AbjC3Nin (ORCPT + 99 others); Thu, 30 Mar 2023 09:38:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49940 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229966AbjC3Nil (ORCPT ); Thu, 30 Mar 2023 09:38:41 -0400 Received: from smtpout.efficios.com (smtpout.efficios.com [167.114.26.122]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9ECCDB44C; Thu, 30 Mar 2023 06:38:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1680183504; bh=24hs/GAOgBlVSR4B3MD3Qa1OeM+tlMUGandZTll4v9o=; h=From:To:Cc:Subject:Date:From; b=P4hVo2EZZRdByxjRo59jz0QLN9PDmvFRp1opXBJvMaYkvg2EASQ9fPugdPpcXsu2g LOhcUyR2joIXhVYMOdYsHnPIav9cWlqmrlCblMZsHRbJYibESdYmYRvnaRjADKiqm5 j0zdo2Dfqi06FIVg6EH6dYNbEuAj2JMMbpnSVlA+RdMWr8f/BudEMQvMNsMMSwnwZA CPQFJNB/IBo7aYkNiOJskGnM2Vqdqdvd3IjhFyE5TRZ0pKI0KBZhKf2zlNkXwpr/3E UEb7ynurlSL8qN/y3zJcu43QACN215cPl2d/UcsZfRnBrhjoR3E7rV7enw90eVURDy ISZ5k5GBWUw0Q== Received: from localhost.localdomain (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4PnPdD01kRztMX; Thu, 30 Mar 2023 09:38:23 -0400 (EDT) From: Mathieu Desnoyers To: Andrew Morton Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , Shakeel Butt , Marek Szyprowski , linux-mm@kvack.org, stable@vger.kernel.org Subject: [PATCH 1/1] mm: Fix memory leak on mm_init error handling Date: Thu, 30 Mar 2023 09:38:22 -0400 Message-Id: <20230330133822.66271-1-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Spam-Status: No, score=-0.2 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1761802282508791186?= X-GMAIL-MSGID: =?utf-8?q?1761802282508791186?= commit f1a7941243c1 ("mm: convert mm's rss stats into percpu_counter") introduces a memory leak by missing a call to destroy_context() when a percpu_counter fails to allocate. Before introducing the per-cpu counter allocations, init_new_context() was the last call that could fail in mm_init(), and thus there was no need to ever invoke destroy_context() in the error paths. Adding the following percpu counter allocations adds error paths after init_new_context(), which means its associated destroy_context() needs to be called when percpu counters fail to allocate. Signed-off-by: Mathieu Desnoyers Cc: Shakeel Butt Cc: Andrew Morton Cc: Marek Szyprowski Cc: linux-mm@kvack.org Cc: stable@vger.kernel.org # 6.2 Acked-by: Shakeel Butt --- kernel/fork.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/fork.c b/kernel/fork.c index c0257cbee093..c983c4fe3090 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1171,6 +1171,7 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p, fail_pcpu: while (i > 0) percpu_counter_destroy(&mm->rss_stat[--i]); + destroy_context(mm); fail_nocontext: mm_free_pgd(mm); fail_nopgd: