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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31777C433F5 for ; Tue, 16 Nov 2021 00:42:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1DF4061AF0 for ; Tue, 16 Nov 2021 00:42:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347285AbhKPApP (ORCPT ); Mon, 15 Nov 2021 19:45:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:44610 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1343800AbhKOTWD (ORCPT ); Mon, 15 Nov 2021 14:22:03 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id B905F635E0; Mon, 15 Nov 2021 18:46:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1637001999; bh=eQldb7xtL2MugtVMfHpPnRADpnEJoVv3mCGZH3dhEA0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ttRoUG6a814hjtRdZ0Lw3yGt2FU8OdiXomFyJzkiRr/dGia5mzzAaxwypAOrYgIxB 6um1klYTx8eKqA6rEpSD++jcF2nC9ISebpkoRRq1was3oS6qx9oGIZcZQniKY4sOzS HqMHnQPJkbQmxYS/WxgcB0xALYabl2w2xDOgnxn8= 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 5.15 400/917] media: em28xx: Dont use ops->suspend if it is NULL Date: Mon, 15 Nov 2021 17:58:15 +0100 Message-Id: <20211115165442.352384929@linuxfoundation.org> X-Mailer: git-send-email 2.33.1 In-Reply-To: <20211115165428.722074685@linuxfoundation.org> References: <20211115165428.722074685@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: stable@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 584fa400cd7d8..acc0bf7dbe2b1 100644 --- a/drivers/media/usb/em28xx/em28xx-core.c +++ b/drivers/media/usb/em28xx/em28xx-core.c @@ -1154,8 +1154,9 @@ 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