| From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 074/145] USB: serial: digi_acceleport: fix OOB-event processing | Date | Sun, 16 Apr 2017 12:49:27 +0200 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@kernel.org>
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: Ben Hutchings <ben@decadent.org.uk> Fixes: 2d380889215f ("USB: serial: digi_acceleport: fix OOB data sanity check") Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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 @@ -1492,7 +1492,7 @@ 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];
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