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 D9116C433FE for ; Mon, 23 May 2022 17:14:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239887AbiEWROl (ORCPT ); Mon, 23 May 2022 13:14:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240482AbiEWRM3 (ORCPT ); Mon, 23 May 2022 13:12:29 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E1849583AB; Mon, 23 May 2022 10:11:36 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id ABF29614EB; Mon, 23 May 2022 17:09:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91CFBC34115; Mon, 23 May 2022 17:09:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1653325786; bh=4rBaSOrIJjKLFiIam8gz65RXThh97E5diUSE/kUbUD4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DuogWZftBiuZAFqxiVk4hXngnMU431IQq3vTdL4hKfndcL3DXqB4C1UgvLEEIodP/ CRGyCHE8TnGLNJdDRtmxv7M+Lv9SwUUE1eybSoXFFIqoodzem8K9s6ExjbEI+NT5+V N4u1NKEmo0kySmNG0fYcJvH4Ky5FKABE52r5/mx8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Tomasz=20Mo=C5=84?= , Jeff LaBundy , Dmitry Torokhov , Sasha Levin Subject: [PATCH 4.19 03/44] Input: add bounds checking to input_set_capability() Date: Mon, 23 May 2022 19:04:47 +0200 Message-Id: <20220523165754.069303666@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220523165752.797318097@linuxfoundation.org> References: <20220523165752.797318097@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: Jeff LaBundy [ Upstream commit 409353cbe9fe48f6bc196114c442b1cff05a39bc ] Update input_set_capability() to prevent kernel panic in case the event code exceeds the bitmap for the given event type. Suggested-by: Tomasz Moń Signed-off-by: Jeff LaBundy Reviewed-by: Tomasz Moń Link: https://lore.kernel.org/r/20220320032537.545250-1-jeff@labundy.com Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/input.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/drivers/input/input.c b/drivers/input/input.c index a0d90022fcf7..dcbf53b5b2bc 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -50,6 +50,17 @@ static DEFINE_MUTEX(input_mutex); static const struct input_value input_value_sync = { EV_SYN, SYN_REPORT, 1 }; +static const unsigned int input_max_code[EV_CNT] = { + [EV_KEY] = KEY_MAX, + [EV_REL] = REL_MAX, + [EV_ABS] = ABS_MAX, + [EV_MSC] = MSC_MAX, + [EV_SW] = SW_MAX, + [EV_LED] = LED_MAX, + [EV_SND] = SND_MAX, + [EV_FF] = FF_MAX, +}; + static inline int is_event_supported(unsigned int code, unsigned long *bm, unsigned int max) { @@ -1915,6 +1926,14 @@ EXPORT_SYMBOL(input_free_device); */ void input_set_capability(struct input_dev *dev, unsigned int type, unsigned int code) { + if (type < EV_CNT && input_max_code[type] && + code > input_max_code[type]) { + pr_err("%s: invalid code %u for type %u\n", __func__, code, + type); + dump_stack(); + return; + } + switch (type) { case EV_KEY: __set_bit(code, dev->keybit); -- 2.35.1