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 13C68C4707F for ; Thu, 7 Apr 2022 01:31:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241873AbiDGBbe (ORCPT ); Wed, 6 Apr 2022 21:31:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32966 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238588AbiDGBSY (ORCPT ); Wed, 6 Apr 2022 21:18:24 -0400 Received: from sin.source.kernel.org (sin.source.kernel.org [IPv6:2604:1380:40e1:4800::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4BC591890C8; Wed, 6 Apr 2022 18:13:15 -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 sin.source.kernel.org (Postfix) with ESMTPS id BE4DBCE2519; Thu, 7 Apr 2022 01:13:13 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5AAD0C385A3; Thu, 7 Apr 2022 01:13:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1649293992; bh=ZxERjJN2xL45S6oKLKU5GRaDVAklc6MvrPJF7AQQpm4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BuUwWpNvGZCOiIuFzWFHkmFwDwbsu87SKO7tNWnOTQR9pwQXLbckUaCzSo9df7/gS jdTXBqr56OApPOJD4gStEiVt0Y3NJ9lpBY/kZBfbzzNahbx4wC1XeWKkA6PiSMNRXe ltxZOFN9yaNP5yIo4m/HNu44XbSIGxjJmCX3it+3Gk5dpDQ9ItUlkKWuuRHKnxfBXt CSNLjw1T6DjwlyRap6KhcGMl1d9o1EzxC0NnMxrAEP+mfDZ7RdiqU6yBRJjOx6ZiDd rcLhHWYa4ZUM5KI7m9BNDJSYSn9V9NweMgdb4cBf4aHNLQPESsI/zdu5vfuocYOqw1 y/YlLTFu1XcMA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jeff LaBundy , =?UTF-8?q?Tomasz=20Mo=C5=84?= , Dmitry Torokhov , Sasha Levin , linux-input@vger.kernel.org Subject: [PATCH AUTOSEL 5.15 06/27] Input: add bounds checking to input_set_capability() Date: Wed, 6 Apr 2022 21:12:36 -0400 Message-Id: <20220407011257.114287-6-sashal@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220407011257.114287-1-sashal@kernel.org> References: <20220407011257.114287-1-sashal@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore 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 c3139bc2aa0d..42099c8c417c 100644 --- a/drivers/input/input.c +++ b/drivers/input/input.c @@ -47,6 +47,17 @@ 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) { @@ -2074,6 +2085,14 @@ EXPORT_SYMBOL(input_get_timestamp); */ 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