linux-kernel - [PATCH 3.18 024/185] HID: roccat: prevent an out of bounds read in kovaplus_profile

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Message-Id: <20180528100051.993092887@linuxfoundation.org>
Date:   Mon, 28 May 2018 12:01:05 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Silvan Jegen <s.jegen@...il.com>,
        Jiri Kosina <jkosina@...e.cz>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 3.18 024/185] HID: roccat: prevent an out of bounds read in kovaplus_profile_activated()

3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 7ad81482cad67cbe1ec808490d1ddfc420c42008 ]

We get the "new_profile_index" value from the mouse device when we're
handling raw events.  Smatch taints it as untrusted data and complains
that we need a bounds check.  This seems like a reasonable warning
otherwise there is a small read beyond the end of the array.

Fixes: 0e70f97f257e ("HID: roccat: Add support for Kova[+] mouse")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Silvan Jegen <s.jegen@...il.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/hid/hid-roccat-kovaplus.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/hid/hid-roccat-kovaplus.c
+++ b/drivers/hid/hid-roccat-kovaplus.c
@@ -37,6 +37,8 @@ static uint kovaplus_convert_event_cpi(u
 static void kovaplus_profile_activated(struct kovaplus_device *kovaplus,
 		uint new_profile_index)
 {
+	if (new_profile_index >= ARRAY_SIZE(kovaplus->profile_settings))
+		return;
 	kovaplus->actual_profile = new_profile_index;
 	kovaplus->actual_cpi = kovaplus->profile_settings[new_profile_index].cpi_startup_level;
 	kovaplus->actual_x_sensitivity = kovaplus->profile_settings[new_profile_index].sensitivity_x;