[PATCH 3.2 032/101] USB: serial: digi_acceleport: fix OOB-event processing

From: Ben Hutchings
Date: Thu Jun 01 2017 - 13:08:10 EST


3.2.89-rc1 review patch. If anyone has any objections, please let me know.

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

From: Johan Hovold <johan@xxxxxxxxxx>

commit 2f6821462fe3ace62df3f1b5a9463153e8288298 upstream.

A recent change claimed to fix an off-by-one error in the OOB-port
completion handler, but instead introduced such an error. This could
specifically led to modem-status changes going unnoticed, effectively
breaking TIOCMGET.

Note that the offending commit fixes a loop-condition underflow and is
marked for stable, but should not be backported without this fix.

Reported-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Fixes: 2d380889215f ("USB: serial: digi_acceleport: fix OOB data sanity check")
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/usb/serial/digi_acceleport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -1758,7 +1758,7 @@ static int digi_read_oob_callback(struct
return -1;

/* handle each oob command */
- for (i = 0; i < urb->actual_length - 4; i += 4) {
+ for (i = 0; i < urb->actual_length - 3; i += 4) {
opcode = buf[i];
line = buf[i + 1];
status = buf[i + 2];