[PATCH 6.10 071/375] net: mctp-serial: Fix missing escapes on transmit

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

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

From: Matt Johnston <matt@xxxxxxxxxxxxxxxxxxxx>

commit f962e8361adfa84e8252d3fc3e5e6bb879f029b1 upstream.

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@xxxxxxxxxxxxxxx
Fixes: a0c2ccd9b5ad ("mctp: Add MCTP-over-serial transport binding")
Signed-off-by: Matt Johnston <matt@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/mctp/mctp-serial.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- 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_se
 	 * 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;
 	}
 






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