linux-kernel - [PATCH AUTOSEL 4.9 1/6] HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl

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Message-Id: <20200831153150.1024799-1-sashal@kernel.org>
Date:   Mon, 31 Aug 2020 11:31:44 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        syzbot+34ee1b45d88571c2fa8b@...kaller.appspotmail.com,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Jiri Kosina <jkosina@...e.cz>, Sasha Levin <sashal@...nel.org>,
        linux-usb@...r.kernel.org, linux-input@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 1/6] HID: hiddev: Fix slab-out-of-bounds write in hiddev_ioctl_usage()

From: Peilin Ye <yepeilin.cs@...il.com>

[ Upstream commit 25a097f5204675550afb879ee18238ca917cba7a ]

`uref->usage_index` is not always being properly checked, causing
hiddev_ioctl_usage() to go out of bounds under some cases. Fix it.

Reported-by: syzbot+34ee1b45d88571c2fa8b@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=f2aebe90b8c56806b050a20b36f51ed6acabe802
Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hid/usbhid/hiddev.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c
index dbdd265075daf..7bce23a43907e 100644
--- a/drivers/hid/usbhid/hiddev.c
+++ b/drivers/hid/usbhid/hiddev.c
@@ -554,12 +554,16 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd,
 
 		switch (cmd) {
 		case HIDIOCGUSAGE:
+			if (uref->usage_index >= field->report_count)
+				goto inval;
 			uref->value = field->value[uref->usage_index];
 			if (copy_to_user(user_arg, uref, sizeof(*uref)))
 				goto fault;
 			goto goodreturn;
 
 		case HIDIOCSUSAGE:
+			if (uref->usage_index >= field->report_count)
+				goto inval;
 			field->value[uref->usage_index] = uref->value;
 			goto goodreturn;
 
-- 
2.25.1