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 X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 DE023C433DB for ; Wed, 24 Feb 2021 13:09:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AFE9E64E02 for ; Wed, 24 Feb 2021 13:09:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235880AbhBXNHz (ORCPT ); Wed, 24 Feb 2021 08:07:55 -0500 Received: from mail.kernel.org ([198.145.29.99]:50150 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234143AbhBXMx0 (ORCPT ); Wed, 24 Feb 2021 07:53:26 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id A46AB64F1B; Wed, 24 Feb 2021 12:51:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1614171081; bh=gftKk1v/Nzl6DahF5lzpD5Z+bu6E7udThqN4RYyJWys=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FWDljO6DGPGLsAs969t2qExS4wK+dAPysib2vwKv3+mm240Jw2+wM4BXHg7zrarc4 h4PfnOU7S77MOyZwIT74J7TE9EIhZUBoy3a6JMgRtPPiPaQbem4ZO6YS3Pq5b7cSza c8xCAAz5qWLHciumy/VC64P2t7bARHDTZ/pMAdPDdr8hI853EL6d7fdZim2nM5O0ts hOEdeBNQ2cfXMwB4hLZMneLy9YMLHoJ7fejIsi8LRuSe/B5NNJcH5Y7q1y2xyIsEg+ miHAr1X+ONvFJb+bwc+fgLkIgonJs1asVDLAjA+VTKQCJL+LuaVGhjRffuN417AYTk 1ZUItz5FcV1cw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Ricardo Ribalda , Laurent Pinchart , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 5.11 40/67] media: uvcvideo: Allow entities with no pads Date: Wed, 24 Feb 2021 07:49:58 -0500 Message-Id: <20210224125026.481804-40-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210224125026.481804-1-sashal@kernel.org> References: <20210224125026.481804-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 ddb9eaa11be71..5ad5282641350 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; -- 2.27.0