From nobody Thu Sep 18 08:30:15 2025 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 16A91C4708D for ; Thu, 8 Dec 2022 03:16:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229731AbiLHDQi (ORCPT ); Wed, 7 Dec 2022 22:16:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57572 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229628AbiLHDQ3 (ORCPT ); Wed, 7 Dec 2022 22:16:29 -0500 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 9945389314 for ; Wed, 7 Dec 2022 19:16:26 -0800 (PST) Received: from localhost.localdomain (unknown [124.16.138.125]) by APP-01 (Coremail) with SMTP id qwCowAAXmewGV5Fj8eepBQ--.45513S2; Thu, 08 Dec 2022 11:16:22 +0800 (CST) From: Jiasheng Jiang To: robin.murphy@arm.com, liviu.dudau@arm.com, brian.starkey@arm.com, airlied@gmail.com, daniel@ffwll.ch Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Jiasheng Jiang Subject: [PATCH] drm: mali-dp: Add check for kzalloc Date: Thu, 8 Dec 2022 11:16:21 +0800 Message-Id: <20221208031621.3274-1-jiasheng@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: qwCowAAXmewGV5Fj8eepBQ--.45513S2 X-Coremail-Antispam: 1UD129KBjvJXoWruw4fCr1kKFyUWFyxAw13Jwb_yoW8Jry7pr 48trZakr95ZF45KrZrAa1kurn8Ca9IvFyxKFykWw15uw10g3s8AF4kKas8Wa1UJrZxJr1a yanFqF4fZFn0kw7anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUUvG14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26r4j6ryUM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Gr1j6F4UJwA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gr 1j6F4UJwAS0I0E0xvYzxvE52x082IY62kv0487Mc02F40EFcxC0VAKzVAqx4xG6I80ewAv 7VC0I7IYx2IY67AKxVWUGVWUXwAv7VC2z280aVAFwI0_Jr0_Gr1lOx8S6xCaFVCjc4AY6r 1j6r4UM4x0Y48IcxkI7VAKI48JM4x0x7Aq67IIx4CEVc8vx2IErcIFxwCY1x0262kKe7AK xVWUAVWUtwCY02Avz4vE14v_Gr4l42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x0Yz7v_Jr 0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2zVAF1VAY 17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF4lIxAIcV C0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWUCwCI42IY 6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCTnIWIevJa 73UjIFyTuYvjfUeGYpUUUUU X-Originating-IP: [124.16.138.125] X-CM-SenderInfo: pmld2xxhqjqxpvfd2hldfou0/ Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" As kzalloc may fail and return NULL pointer, the "mw_state" can be NULL. If the layout of struct malidp_mw_connector_state ever changes, it will cause NULL poineter derefernce of "&mw_state->base". Therefore, the "mw_state" should be checked whether it is NULL in order to improve the robust. Fixes: 8cbc5caf36ef ("drm: mali-dp: Add writeback connector") Signed-off-by: Jiasheng Jiang --- drivers/gpu/drm/arm/malidp_mw.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/arm/malidp_mw.c b/drivers/gpu/drm/arm/malidp_m= w.c index ef76d0e6ee2f..fe4474c2ddcf 100644 --- a/drivers/gpu/drm/arm/malidp_mw.c +++ b/drivers/gpu/drm/arm/malidp_mw.c @@ -72,7 +72,11 @@ static void malidp_mw_connector_reset(struct drm_connect= or *connector) __drm_atomic_helper_connector_destroy_state(connector->state); =20 kfree(connector->state); - __drm_atomic_helper_connector_reset(connector, &mw_state->base); + + if (mw_state) + __drm_atomic_helper_connector_reset(connector, &mw_state->base); + else + __drm_atomic_helper_connector_reset(connector, NULL); } =20 static enum drm_connector_status --=20 2.25.1