From mboxrd@z Thu Jan 1 00:00:00 1970 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 CD378C433EF for ; Wed, 24 Nov 2021 13:01:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344247AbhKXNET (ORCPT ); Wed, 24 Nov 2021 08:04:19 -0500 Received: from mail.kernel.org ([198.145.29.99]:41110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1346807AbhKXNCV (ORCPT ); Wed, 24 Nov 2021 08:02:21 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8BA04619E9; Wed, 24 Nov 2021 12:35:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637757346; bh=7NmHKJhBuQmvjxD9pIk7Xc7mYPo+QYRzuSCsYcyqECk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=V4Vhp0jfTodNrUyQ2ggRPvcW6N64r/XwlM6ByL8ROzJSOYH6wG8k+VjvnNgZKza5k mVkG9MA7PX8SzhWU2FwmCgZZJ2+yDz8kNAIlhNlMBj5Hv2ZZ0uH6mvRsSBUZwiWgIZ 4vO82kc3/EWeUoqLf2bfJ3ZzF3O4TDmn5sGdDSJw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Colin Ian King , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 4.19 137/323] media: em28xx: Dont use ops->suspend if it is NULL Date: Wed, 24 Nov 2021 12:55:27 +0100 Message-Id: <20211124115723.553657243@linuxfoundation.org> X-Mailer: git-send-email 2.34.0 In-Reply-To: <20211124115718.822024889@linuxfoundation.org> References: <20211124115718.822024889@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King [ Upstream commit 51fa3b70d27342baf1ea8aaab3e96e5f4f26d5b2 ] The call to ops->suspend for the dev->dev_next case can currently trigger a call on a null function pointer if ops->suspend is null. Skip over the use of function ops->suspend if it is null. Addresses-Coverity: ("Dereference after null check") Fixes: be7fd3c3a8c5 ("media: em28xx: Hauppauge DualHD second tuner functionality") Signed-off-by: Colin Ian King Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/em28xx/em28xx-core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/em28xx/em28xx-core.c b/drivers/media/usb/em28xx/em28xx-core.c index d0f95a5cb4d23..437651307056f 100644 --- a/drivers/media/usb/em28xx/em28xx-core.c +++ b/drivers/media/usb/em28xx/em28xx-core.c @@ -1151,8 +1151,9 @@ int em28xx_suspend_extension(struct em28xx *dev) dev_info(&dev->intf->dev, "Suspending extensions\n"); mutex_lock(&em28xx_devlist_mutex); list_for_each_entry(ops, &em28xx_extension_devlist, next) { - if (ops->suspend) - ops->suspend(dev); + if (!ops->suspend) + continue; + ops->suspend(dev); if (dev->dev_next) ops->suspend(dev->dev_next); } -- 2.33.0