From 410534a34315b846a235542f886566a4908d25a4 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 4 Jul 2018 17:02:18 +0200 Subject: [PATCH] USB: serial: kobil_sct: fix modem-status error handling [ Upstream commit a420b5d939ee58f1d950f0ea782834056520aeaa ] Make sure to return -EIO in case of a short modem-status read request. While at it, split the debug message to not include the (zeroed) transfer-buffer content in case of errors. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Johan Hovold Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/kobil_sct.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/usb/serial/kobil_sct.c b/drivers/usb/serial/kobil_sct.c index 3024b9b25360..75181d3afd95 100644 --- a/drivers/usb/serial/kobil_sct.c +++ b/drivers/usb/serial/kobil_sct.c @@ -397,12 +397,20 @@ static int kobil_tiocmget(struct tty_struct *tty) transfer_buffer_length, KOBIL_TIMEOUT); - dev_dbg(&port->dev, "%s - Send get_status_line_state URB returns: %i. Statusline: %02x\n", - __func__, result, transfer_buffer[0]); + dev_dbg(&port->dev, "Send get_status_line_state URB returns: %i\n", + result); + if (result < 1) { + if (result >= 0) + result = -EIO; + goto out_free; + } + + dev_dbg(&port->dev, "Statusline: %02x\n", transfer_buffer[0]); result = 0; if ((transfer_buffer[0] & SUSBCR_GSL_DSR) != 0) result = TIOCM_DSR; +out_free: kfree(transfer_buffer); return result; }