linux-kernel - [PATCH 3.16 04/72] leds: leds-lp5562 allow firmware files up to the maximum length

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Date:   Sun, 08 Dec 2019 13:52:48 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Jacek Anaszewski" <jacek.anaszewski@...il.com>,
        "Nick Stoughton" <nstoughton@...itech.com>,
        "Pavel Machek" <pavel@....cz>
Subject: [PATCH 3.16 04/72] leds: leds-lp5562 allow firmware files up to
 the maximum length

3.16.79-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Nick Stoughton <nstoughton@...itech.com>

commit ed2abfebb041473092b41527903f93390d38afa7 upstream.

Firmware files are in ASCII, using 2 hex characters per byte. The
maximum length of a firmware string is therefore

16 (commands) * 2 (bytes per command) * 2 (characters per byte) = 64

Fixes: ff45262a85db ("leds: add new LP5562 LED driver")
Signed-off-by: Nick Stoughton <nstoughton@...itech.com>
Acked-by: Pavel Machek <pavel@....cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/leds/leds-lp5562.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/leds/leds-lp5562.c
+++ b/drivers/leds/leds-lp5562.c
@@ -263,7 +263,11 @@ static void lp5562_firmware_loaded(struc
 {
 	const struct firmware *fw = chip->fw;
 
-	if (fw->size > LP5562_PROGRAM_LENGTH) {
+	/*
+	 * the firmware is encoded in ascii hex character, with 2 chars
+	 * per byte
+	 */
+	if (fw->size > (LP5562_PROGRAM_LENGTH * 2)) {
 		dev_err(&chip->cl->dev, "firmware data size overflow: %zu\n",
 			fw->size);
 		return;