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")
Cc: stable <stable@xxxxxxxxxxxxxxx> # v2.6.30
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/digi_acceleport.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/serial/digi_acceleport.c b/drivers/usb/serial/digi_acceleport.c
index eb433922598c..7ab3235febfc 100644
--- a/drivers/usb/serial/digi_acceleport.c
+++ b/drivers/usb/serial/digi_acceleport.c
@@ -1499,7 +1499,7 @@ 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];
--
2.11.1
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