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From:   Sasha Levin <Alexander.Levin@microsoft.com>
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        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
CC:     Dan Carpenter <dan.carpenter@oracle.com>,
        Jiri Kosina <jkosina@suse.cz>,
        Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL for 4.15 073/189] HID: roccat: prevent an out of
 bounds read in kovaplus_profile_activated()
Thread-Topic: [PATCH AUTOSEL for 4.15 073/189] HID: roccat: prevent an out of
 bounds read in kovaplus_profile_activated()
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Date:   Mon, 9 Apr 2018 00:17:42 +0000
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From: Dan Carpenter <dan.carpenter@oracle.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@oracle.com>
Acked-by: Silvan Jegen <s.jegen@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 drivers/hid/hid-roccat-kovaplus.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hid/hid-roccat-kovaplus.c b/drivers/hid/hid-roccat-kov=
aplus.c
index 43617fb28b87..317c9c2c0a7c 100644
--- a/drivers/hid/hid-roccat-kovaplus.c
+++ b/drivers/hid/hid-roccat-kovaplus.c
@@ -37,6 +37,8 @@ static uint kovaplus_convert_event_cpi(uint value)
 static void kovaplus_profile_activated(struct kovaplus_device *kovaplus,
 		uint new_profile_index)
 {
+	if (new_profile_index >=3D ARRAY_SIZE(kovaplus->profile_settings))
+		return;
 	kovaplus->actual_profile =3D new_profile_index;
 	kovaplus->actual_cpi =3D kovaplus->profile_settings[new_profile_index].cp=
i_startup_level;
 	kovaplus->actual_x_sensitivity =3D kovaplus->profile_settings[new_profile=
_index].sensitivity_x;
--=20
2.15.1