6.1-stable review patch. If anyone has any objections, please let me know.
------------------
From: Matt Johnston matt@codeconstruct.com.au
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@vger.kernel.org Fixes: a0c2ccd9b5ad ("mctp: Add MCTP-over-serial transport binding") Signed-off-by: Matt Johnston matt@codeconstruct.com.au Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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; }