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[2620:137:e000::1:20]) by mx.google.com with ESMTP id t189-20020a6381c6000000b0050a16d20f02si1521310pgd.688.2023.03.12.09.51.49; Sun, 12 Mar 2023 09:52:05 -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=@163.com header.s=s110527 header.b=O5JbGqq+; 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=163.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230071AbjCLQJS (ORCPT + 99 others); Sun, 12 Mar 2023 12:09:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59800 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230050AbjCLQJP (ORCPT ); Sun, 12 Mar 2023 12:09:15 -0400 Received: from m12.mail.163.com (m12.mail.163.com [220.181.12.216]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B23AB36454; Sun, 12 Mar 2023 09:09:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=KI84V tG+lYqaZnPKW41rtqtNaa7xafoaTjef1FxWfNk=; b=O5JbGqq+arN23HQxkzzqT 16DPhluNdsKhhWqNAGjvgJcToQ6opfINB3wmSN4fXeJc/1htJfJaDJWI4MSLJUqF 36WIXaAuxlR3igqyXLTJljNN4fM0BnlmCT2VnDZVVWeUWADVy0kLvE3FvoTNj8/G Pz91ZBKEjEUzGqIb5lf2BE= Received: from leanderwang-LC2.localdomain (unknown [111.206.145.21]) by zwqz-smtp-mta-g4-3 (Coremail) with SMTP id _____wAXRBAG+Q1kULNrDA--.9072S2; Mon, 13 Mar 2023 00:08:38 +0800 (CST) From: Zheng Wang To: krzysztof.kozlowski@linaro.org Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, hackerzheng666@gmail.com, 1395428693sheep@gmail.com, alex000young@gmail.com, Zheng Wang Subject: [PATCH] nfc: st-nci: Fix use after free bug in ndlc_remove due to race condition Date: Mon, 13 Mar 2023 00:08:37 +0800 Message-Id: <20230312160837.2040857-1-zyytlz.wz@163.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: _____wAXRBAG+Q1kULNrDA--.9072S2 X-Coremail-Antispam: 1Uf129KBjvJXoW7WFyrJFyrKw47KFy7WF18uFg_yoW8XFWkpr ZxXryruFWrGF4FyFZ7WF4UGr1YkwsrtryDK3y3W343ZFnayrs0qr92yFW5uF1IqF4IyFW2 y3yDX3Z8Ja4kCa7anT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0ziJDGrUUUUU= X-Originating-IP: [111.206.145.21] X-CM-SenderInfo: h2113zf2oz6qqrwthudrp/1tbiXQkwU1WBo4he9QAAsj X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,RCVD_IN_MSPIKE_H2, SPF_HELO_NONE,SPF_PASS autolearn=ham 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?1760181537748682111?= X-GMAIL-MSGID: =?utf-8?q?1760181537748682111?= This bug influences both st_nci_i2c_remove and st_nci_spi_remove. Take st_nci_i2c_remove as an example. In st_nci_i2c_probe, it called ndlc_probe and bound &ndlc->sm_work with llt_ndlc_sm_work. When it calls ndlc_recv or timeout handler, it will finally call schedule_work to start the work. When we call st_nci_i2c_remove to remove the driver, there may be a sequence as follows: Fix it by finishing the work before cleanup in ndlc_remove CPU0 CPU1 |llt_ndlc_sm_work st_nci_i2c_remove | ndlc_remove | st_nci_remove | nci_free_device| kfree(ndev) | //free ndlc->ndev | |llt_ndlc_rcv_queue |nci_recv_frame |//use ndlc->ndev Fixes: 35630df68d60 ("NFC: st21nfcb: Add driver for STMicroelectronics ST21NFCB NFC chip") Signed-off-by: Zheng Wang Reviewed-by: Krzysztof Kozlowski --- drivers/nfc/st-nci/ndlc.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/nfc/st-nci/ndlc.c b/drivers/nfc/st-nci/ndlc.c index 755460a73c0d..d2aa9f766738 100644 --- a/drivers/nfc/st-nci/ndlc.c +++ b/drivers/nfc/st-nci/ndlc.c @@ -282,13 +282,15 @@ EXPORT_SYMBOL(ndlc_probe); void ndlc_remove(struct llt_ndlc *ndlc) { - st_nci_remove(ndlc->ndev); - /* cancel timers */ del_timer_sync(&ndlc->t1_timer); del_timer_sync(&ndlc->t2_timer); ndlc->t2_active = false; ndlc->t1_active = false; + /* cancel work */ + cancel_work_sync(&ndlc->sm_work); + + st_nci_remove(ndlc->ndev); skb_queue_purge(&ndlc->rcv_q); skb_queue_purge(&ndlc->send_q);