linux-kernel - [PATCH 3/3] mfd: rave-sp: Check received frame length before accepting next byte

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Message-Id: <20180226150739.13457-3-andrew.smirnov@gmail.com>
Date:   Mon, 26 Feb 2018 07:07:39 -0800
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        linux-kernel@...r.kernel.org, cphealy@...il.com,
        Lucas Stach <l.stach@...gutronix.de>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 3/3] mfd: rave-sp: Check received frame length before accepting next byte

Check received frame length _before_ accepting next byte in order to
avoid incorrectly rejecting payloads that are RAVE_SP_RX_BUFFER_SIZE
long.

Cc: linux-kernel@...r.kernel.org
Cc: cphealy@...il.com
Cc: Lucas Stach <l.stach@...gutronix.de>
Cc: Lee Jones <lee.jones@...aro.org>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
---
 drivers/mfd/rave-sp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/rave-sp.c b/drivers/mfd/rave-sp.c
index cec1e309b31f..76fa32006a1b 100644
--- a/drivers/mfd/rave-sp.c
+++ b/drivers/mfd/rave-sp.c
@@ -548,8 +548,6 @@ static int rave_sp_receive_buf(struct serdev_device *serdev,
 			/* FALLTHROUGH */
 
 		case RAVE_SP_EXPECT_ESCAPED_DATA:
-			deframer->data[deframer->length++] = byte;
-
 			if (deframer->length == sizeof(deframer->data)) {
 				dev_warn(dev, "Bad frame: Too long\n");
 				/*
@@ -564,6 +562,8 @@ static int rave_sp_receive_buf(struct serdev_device *serdev,
 				goto reset_framer;
 			}
 
+			deframer->data[deframer->length++] = byte;
+
 			/*
 			 * We've extracted out special byte, now we
 			 * can go back to regular data collecting
-- 
2.14.3