netdev - [PATCH net 2/2] net: mctp-serial: Fix missing escapes on transmit

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Message-ID: <20240827020803.957250-3-matt@codeconstruct.com.au>
Date: Tue, 27 Aug 2024 10:07:59 +0800
From: Matt Johnston <matt@...econstruct.com.au>
To: jk@...econstruct.com.au
Cc: "David S. Miller" <davem@...emloft.net>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>,
	netdev@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH net 2/2] net: mctp-serial: Fix missing escapes on transmit

0x7d and 0x7e bytes are meant to be escaped in the data portion of
frames, but this didn't occur since next_chunk_len() had an off-by-one
error. That also resulted in the final byte of a payload being written
as a separate tty write op.

The chunk prior to an escaped byte would be one byte short, and the
next call would never test the txpos+1 case, which is where the escaped
byte was located. That meant it never hit the escaping case in
mctp_serial_tx_work().

Example Input: 01 00 08 c8 7e 80 02

Previous incorrect chunks from next_chunk_len():

01 00 08
c8 7e 80
02

With this fix:

01 00 08 c8
7e
80 02

Cc: stable@...r.kernel.org
Fixes: a0c2ccd9b5ad ("mctp: Add MCTP-over-serial transport binding")
Signed-off-by: Matt Johnston <matt@...econstruct.com.au>
---
 drivers/net/mctp/mctp-serial.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mctp/mctp-serial.c b/drivers/net/mctp/mctp-serial.c
index d7db11355909..82890e983847 100644
--- a/drivers/net/mctp/mctp-serial.c
+++ b/drivers/net/mctp/mctp-serial.c
@@ -91,8 +91,8 @@ static int next_chunk_len(struct mctp_serial *dev)
 	 * will be those non-escaped bytes, and does not include the escaped
 	 * byte.
 	 */
-	for (i = 1; i + dev->txpos + 1 < dev->txlen; i++) {
-		if (needs_escape(dev->txbuf[dev->txpos + i + 1]))
+	for (i = 1; i + dev->txpos < dev->txlen; i++) {
+		if (needs_escape(dev->txbuf[dev->txpos + i]))
 			break;
 	}