From patchwork Tue Jan 11 08:16:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jiasheng Jiang X-Patchwork-Id: 12709599 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8F6DBC433EF for ; Tue, 11 Jan 2022 08:18:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=25eKJyO89JsSop7KjR1LQWzZpP6KlO9xhMSX6JZILjc=; b=JnlFXQzisnwtPp eiqYHz2kgLMoHigPadHtkOsBk5ZlIv1Jhx4deuwesGEhrlT/E+aVXG6hW1/c01uDroJwjMFRzo8MG M2ajpGUt3m1R/BazlTX3SkK6EqAS9ghEitjXBe1nq+OERnpc+mcHaDVwpPnH0JsFDZmj6ISUDh7eP iufNxFzkRHO/tCjb4djzSiH1uzkvYOZsv0FDN/t8XTq31fU88jUu3qEwowwEBuOR9VuYNd3MHrrPR xDMshkONabWKgYFamZXiMPeJhfE+xKyhM0JHuclROFj0oV7eO8ikmK5W9Sl/c6dOVW+mo1zlLUq9R W7P9sQYtK9xCHR1PGoVg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n7CLB-00FGp8-SR; Tue, 11 Jan 2022 08:17:14 +0000 Received: from smtp21.cstnet.cn ([159.226.251.21] helo=cstnet.cn) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1n7CL4-00FGn1-VR for linux-arm-kernel@lists.infradead.org; Tue, 11 Jan 2022 08:17:09 +0000 Received: from localhost.localdomain (unknown [124.16.138.126]) by APP-01 (Coremail) with SMTP id qwCowAD3zKXwPN1hL6cqBg--.37574S2; Tue, 11 Jan 2022 16:16:48 +0800 (CST) From: Jiasheng Jiang To: krzysztof.kozlowski@canonical.com, gregkh@linuxfoundation.org, jirislaby@kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org, Jiasheng Jiang Subject: [PATCH] tty: serial: samsung_tty: Check null pointer after calling of_match_node Date: Tue, 11 Jan 2022 16:16:47 +0800 Message-Id: <20220111081647.637752-1-jiasheng@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-CM-TRANSID: qwCowAD3zKXwPN1hL6cqBg--.37574S2 X-Coremail-Antispam: 1UD129KBjvdXoW7GFWkXr1xKry8Cw1DuF18Grg_yoWDKwbEkw nrWasrCr17Cr1ktwn3AryfuF9ayw4DZFn5Z3WFqas3XrZxXF4fXrWvqrnrJ3s7W3yUKFZ8 GrnI9FWfA3Z2qjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbcAFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_Xr0_Ar1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Cr0_ Gr1UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVW0oV Cq3wAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv7VC0 I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r1j6r 4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY02Avz4vE14v_GFyl 42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJV WUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAK I48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r1j6r 4UMIIF0xvE42xK8VAvwI8IcIk0rVWrJr0_WFyUJwCI42IY6I8E87Iv67AKxVWUJVW8JwCI 42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa73UjIFyTuYvjfUeHUDDUUUU X-Originating-IP: [124.16.138.126] X-CM-SenderInfo: pmld2xxhqjqxpvfd2hldfou0/ X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220111_001707_454808_785D27C7 X-CRM114-Status: UNSURE ( 9.02 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org If there is no suitable node, of_match_node() will return NULL pointer. Therefore it should be better to check it in order to avoid the dereference of NULL pointer. And the only caller s3c24xx_serial_probe() has already checked the return value of the s3c24xx_get_driver_data(). So the new check can be dealed with. Fixes: 55ed51fff224 ("{tty: serial, nand: onenand}: samsung: rename to fix build warning") Signed-off-by: Jiasheng Jiang --- drivers/tty/serial/samsung_tty.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c index e2f49863e9c2..efbf9a7d5e92 100644 --- a/drivers/tty/serial/samsung_tty.c +++ b/drivers/tty/serial/samsung_tty.c @@ -2185,6 +2185,9 @@ s3c24xx_get_driver_data(struct platform_device *pdev) const struct of_device_id *match; match = of_match_node(s3c24xx_uart_dt_match, pdev->dev.of_node); + if (!match) + return NULL; + return (struct s3c24xx_serial_drv_data *)match->data; } #endif