From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 9A19D4679F; Tue, 20 May 2025 17:08:22 +0200 (CEST) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id 6702C406BA; Tue, 20 May 2025 17:08:22 +0200 (CEST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) by mails.dpdk.org (Postfix) with ESMTP id 22B62402AE for ; Tue, 20 May 2025 17:08:20 +0200 (CEST) Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4b1yVT684lz6M4w5; Tue, 20 May 2025 23:03:29 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id EB36F140447; Tue, 20 May 2025 23:08:19 +0800 (CST) Received: from localhost.localdomain (10.220.239.45) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Tue, 20 May 2025 17:08:19 +0200 From: Rui Ferreira To: Thomas Monjalon CC: Subject: [PATCH] eal/linux: unregister alarm callback before free ptr Date: Tue, 20 May 2025 12:01:50 -0400 Message-ID: <20250520160150.50401-1-rui.ferreira1@h-partners.com> X-Mailer: git-send-email 2.35.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.220.239.45] X-ClientProxiedBy: frapeml500002.china.huawei.com (7.182.85.205) To frapeml500007.china.huawei.com (7.182.85.172) X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org This was flagged by Address sanitizer as a use after free. The intr_handle ptr is shared between the main thread and the interrupt thread, and the interrupt thread can dereference the ptr after free is called when the main thread cleans up (from the alarm callback). The interrupt thread never terminates (eal_intr_thread_main) so use rte_intr_callback_unregister_sync during cleanup to ensure the callback is removed before freeing the ptr. To be more defensive clear out the pointer and registration variable if we can unregister. Bugzilla ID: 1683 Signed-off-by: Rui Ferreira --- .mailmap | 1 + lib/eal/linux/eal_alarm.c | 9 ++++++++- 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/.mailmap b/.mailmap index d8439b79ce..907c5ea967 100644 --- a/.mailmap +++ b/.mailmap @@ -1332,6 +1332,7 @@ Rosen Xu Roy Franz Roy Pledge Roy Shterman +Rui Ferreira Ruifeng Wang Rushil Gupta Ryan E Hall diff --git a/lib/eal/linux/eal_alarm.c b/lib/eal/linux/eal_alarm.c index b216a007a3..eb6a21d4f0 100644 --- a/lib/eal/linux/eal_alarm.c +++ b/lib/eal/linux/eal_alarm.c @@ -57,7 +57,14 @@ static void eal_alarm_callback(void *arg); void rte_eal_alarm_cleanup(void) { - rte_intr_instance_free(intr_handle); + /* unregister callback using intr_handle in interrupt thread */ + int ret = rte_intr_callback_unregister_sync(intr_handle, + eal_alarm_callback, (void *)-1); + if (ret >= 0) { + rte_intr_instance_free(intr_handle); + intr_handle = NULL; + handler_registered = 0; + } } int -- 2.35.3