From patchwork Tue May 29 09:57:59 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Tissoires X-Patchwork-Id: 10434709 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id A1528601E9 for ; Tue, 29 May 2018 09:59:22 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 925DC286B8 for ; Tue, 29 May 2018 09:59:22 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 85A83286BA; Tue, 29 May 2018 09:59:22 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3A9B2286B8 for ; Tue, 29 May 2018 09:59:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932916AbeE2J6Y (ORCPT ); Tue, 29 May 2018 05:58:24 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:42236 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S932904AbeE2J6U (ORCPT ); Tue, 29 May 2018 05:58:20 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3E357818BAF3; Tue, 29 May 2018 09:58:20 +0000 (UTC) Received: from plouf.banquise.eu.com (ovpn-116-67.ams2.redhat.com [10.36.116.67]) by smtp.corp.redhat.com (Postfix) with ESMTP id F0D6311166E7; Tue, 29 May 2018 09:58:18 +0000 (UTC) From: Benjamin Tissoires To: Jiri Kosina , Dmitry Torokhov Cc: Mario.Limonciello@dell.com, Peter Hutterer , linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Benjamin Tissoires Subject: [PATCH 8/9] HID: core: do not upper bound the collection stack Date: Tue, 29 May 2018 11:57:59 +0200 Message-Id: <20180529095800.13504-9-benjamin.tissoires@redhat.com> In-Reply-To: <20180529095800.13504-1-benjamin.tissoires@redhat.com> References: <20180529095800.13504-1-benjamin.tissoires@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.3 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Tue, 29 May 2018 09:58:20 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.8]); Tue, 29 May 2018 09:58:20 +0000 (UTC) for IP:'10.11.54.3' DOMAIN:'int-mx03.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'benjamin.tissoires@redhat.com' RCPT:'' Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Looks like 4 was sufficient until now. However, the Surface Dial needs a stack of 5 and simply fails at probing. Dynamically add HID_COLLECTION_STACK_SIZE to the size of the stack if we hit the upper bound. Checkpatch complains about bare unsigned, so converting those to 'unsigned int' in struct hid_parser Signed-off-by: Benjamin Tissoires --- drivers/hid/hid-core.c | 17 ++++++++++++++--- include/linux/hid.h | 9 +++++---- 2 files changed, 19 insertions(+), 7 deletions(-) diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 355dc7e49562..2f7367b1de00 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -128,9 +128,19 @@ static int open_collection(struct hid_parser *parser, unsigned type) usage = parser->local.usage[0]; - if (parser->collection_stack_ptr == HID_COLLECTION_STACK_SIZE) { - hid_err(parser->device, "collection stack overflow\n"); - return -EINVAL; + if (parser->collection_stack_ptr == parser->collection_stack_size) { + unsigned int *collection_stack; + unsigned int new_size = parser->collection_stack_size + + HID_COLLECTION_STACK_SIZE; + + collection_stack = krealloc(parser->collection_stack, + new_size * sizeof(unsigned int), + GFP_KERNEL); + if (!collection_stack) + return -ENOMEM; + + parser->collection_stack = collection_stack; + parser->collection_stack_size = new_size; } if (parser->device->maxcollection == parser->device->collection_size) { @@ -837,6 +847,7 @@ static int hid_scan_report(struct hid_device *hid) break; } + kfree(parser->collection_stack); vfree(parser); return 0; } diff --git a/include/linux/hid.h b/include/linux/hid.h index 9caa193e0c67..ee2510019033 100644 --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -643,12 +643,13 @@ static inline void hid_set_drvdata(struct hid_device *hdev, void *data) struct hid_parser { struct hid_global global; struct hid_global global_stack[HID_GLOBAL_STACK_SIZE]; - unsigned global_stack_ptr; + unsigned int global_stack_ptr; struct hid_local local; - unsigned collection_stack[HID_COLLECTION_STACK_SIZE]; - unsigned collection_stack_ptr; + unsigned int *collection_stack; + unsigned int collection_stack_ptr; + unsigned int collection_stack_size; struct hid_device *device; - unsigned scan_flags; + unsigned int scan_flags; }; struct hid_class_descriptor {