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Commit 56eb7b8f authored by Johan Hovold's avatar Johan Hovold Committed by Greg Kroah-Hartman
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USB: serial: digi_acceleport: fix OOB-event processing 



commit 2e46565cf622dd0534a9d8bffe152a577b48d7aa 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: default avatarBen Hutchings <ben@decadent.org.uk>
Fixes: 2d380889215f ("USB: serial: digi_acceleport: fix OOB data sanity
check")
Signed-off-by: default avatarJohan Hovold <johan@kernel.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a8d28d80

drivers/usb/serial/digi_acceleport.c

+1 −1
Original line number Diff line number Diff line
@@ -1492,7 +1492,7 @@ static int digi_read_oob_callback(struct urb *urb) 
		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];