From patchwork Fri Mar 5 12:21:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 394446 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51BFFC4321A for ; Fri, 5 Mar 2021 12:27:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C46E6502E for ; Fri, 5 Mar 2021 12:27:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231700AbhCEM1c (ORCPT ); Fri, 5 Mar 2021 07:27:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:35178 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231828AbhCEM1T (ORCPT ); Fri, 5 Mar 2021 07:27:19 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7586565029; Fri, 5 Mar 2021 12:27:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614947239; bh=Z/ZgHd6CqRR3er6Q0w0CyCgNkrMKsP18NjD0gjvJDRc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B8clc1PwS+MTDsyg2uM3Cubr4k+mGz8mck6UdsdOImYgF6AhbNniFtSR6p+XfmDkB OpNWkQ4/y/CIOa43ff9d3AqIxCArzFfzBNYU1KtAcLAKiLM0u5+UnTEiUFrgt7q+w3 tl1SPnbQe0HUNgfDvQz/OM7g8bR878lxTZjzFYHw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ricardo Ribalda , Laurent Pinchart , Mauro Carvalho Chehab , Sasha Levin Subject: [PATCH 5.11 069/104] media: uvcvideo: Allow entities with no pads Date: Fri, 5 Mar 2021 13:21:14 +0100 Message-Id: <20210305120906.551224392@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210305120903.166929741@linuxfoundation.org> References: <20210305120903.166929741@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Ricardo Ribalda [ Upstream commit 7532dad6634031d083df7af606fac655b8d08b5c ] Avoid an underflow while calculating the number of inputs for entities with zero pads. Signed-off-by: Ricardo Ribalda Signed-off-by: Laurent Pinchart Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/usb/uvc/uvc_driver.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index ddb9eaa11be7..5ad528264135 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1028,7 +1028,10 @@ static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id, unsigned int i; extra_size = roundup(extra_size, sizeof(*entity->pads)); - num_inputs = (type & UVC_TERM_OUTPUT) ? num_pads : num_pads - 1; + if (num_pads) + num_inputs = type & UVC_TERM_OUTPUT ? num_pads : num_pads - 1; + else + num_inputs = 0; size = sizeof(*entity) + extra_size + sizeof(*entity->pads) * num_pads + num_inputs; entity = kzalloc(size, GFP_KERNEL); @@ -1044,7 +1047,7 @@ static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id, for (i = 0; i < num_inputs; ++i) entity->pads[i].flags = MEDIA_PAD_FL_SINK; - if (!UVC_ENTITY_IS_OTERM(entity)) + if (!UVC_ENTITY_IS_OTERM(entity) && num_pads) entity->pads[num_pads-1].flags = MEDIA_PAD_FL_SOURCE; entity->bNrInPins = num_inputs;