diff options
| author | Johan Hovold <johan@kernel.org> | 2017-03-06 17:36:40 +0100 |
|---|---|---|
| committer | Johan Hovold <johan@kernel.org> | 2017-03-08 16:14:39 +0100 |
| commit | 654b404f2a222f918af9b0cd18ad469d0c941a8e (patch) | |
| tree | b7e70ce55058ed9d8e8581e152457e3a42b22b5b /drivers/usb/serial/io_ti.c | |
| parent | 367ec1706745912702c187722065285cd4d2aee7 (diff) | |
| download | lwn-654b404f2a222f918af9b0cd18ad469d0c941a8e.tar.gz lwn-654b404f2a222f918af9b0cd18ad469d0c941a8e.zip | |
USB: serial: io_ti: fix information leak in completion handler
Add missing sanity check to the bulk-in completion handler to avoid an
integer underflow that can be triggered by a malicious device.
This avoids leaking 128 kB of memory content from after the URB transfer
buffer to user space.
Fixes: 8c209e6782ca ("USB: make actual_length in struct urb field u32")
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@vger.kernel.org> # 2.6.30
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial/io_ti.c')
| -rw-r--r-- | drivers/usb/serial/io_ti.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c index 4561dd4cde8b..a76b95d32157 100644 --- a/drivers/usb/serial/io_ti.c +++ b/drivers/usb/serial/io_ti.c @@ -1761,7 +1761,7 @@ static void edge_bulk_in_callback(struct urb *urb) port_number = edge_port->port->port_number; - if (edge_port->lsr_event) { + if (urb->actual_length > 0 && edge_port->lsr_event) { edge_port->lsr_event = 0; dev_dbg(dev, "%s ===== Port %u LSR Status = %02x, Data = %02x ======\n", __func__, port_number, edge_port->lsr_mask, *data); |