From: Johan Hovold Date: Fri, 24 Feb 2017 18:11:28 +0000 (+0100) Subject: USB: serial: digi_acceleport: fix OOB-event processing X-Git-Tag: v4.11-rc2~9^2~5 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=2f6821462fe3ace62df3f1b5a9463153e8288298;p=linux.git USB: serial: digi_acceleport: fix OOB-event processing 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 Fixes: 2d380889215f ("USB: serial: digi_acceleport: fix OOB data sanity check") Cc: stable # v2.6.30 Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c index ab78111e0968..6537d3ca2797 100644 --- a/drivers/usb/serial/digi_acceleport.c +++ b/drivers/usb/serial/digi_acceleport.c @@ -1500,7 +1500,7 @@ 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];