linux-kernel - [PATCH 3.16 003/125] HID: logitech: fix bounds checking on LED report size

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Date:	Wed,  3 Sep 2014 15:06:00 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Ben Hawkes <hawkes@...gle.com>,
	Benjamin Tissoires <benjamin.tissoires@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 3.16 003/125] HID: logitech: fix bounds checking on LED report size

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

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

From: Jiri Kosina <jkosina@...e.cz>

commit 51217e69697fba92a06e07e16f55c9a52d8e8945 upstream.

The check on report size for REPORT_TYPE_LEDS in logi_dj_ll_raw_request()
is wrong; the current check doesn't make any sense -- the report allocated
by HID core in hid_hw_raw_request() can be much larger than
DJREPORT_SHORT_LENGTH, and currently logi_dj_ll_raw_request() doesn't
handle this properly at all.

Fix the check by actually trimming down the report size properly if it is
too large.

Reported-by: Ben Hawkes <hawkes@...gle.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
Signed-off-by: Jiri Kosina <jkosina@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/hid/hid-logitech-dj.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/hid/hid-logitech-dj.c
+++ b/drivers/hid/hid-logitech-dj.c
@@ -557,7 +557,7 @@ static int logi_dj_ll_raw_request(struct
 	if (!out_buf)
 		return -ENOMEM;
 
-	if (count < DJREPORT_SHORT_LENGTH - 2)
+	if (count > DJREPORT_SHORT_LENGTH - 2)
 		count = DJREPORT_SHORT_LENGTH - 2;
 
 	out_buf[0] = REPORT_ID_DJ_SHORT;


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