summaryrefslogtreecommitdiffstats
path: root/drivers/usb
diff options
context:
space:
mode:
authorJohan Hovold <johan@kernel.org>2017-03-06 17:36:40 +0100
committerJohan Hovold <johan@kernel.org>2017-03-08 16:14:39 +0100
commit654b404f2a222f918af9b0cd18ad469d0c941a8e (patch)
treeb7e70ce55058ed9d8e8581e152457e3a42b22b5b /drivers/usb
parent367ec1706745912702c187722065285cd4d2aee7 (diff)
downloadop-kernel-dev-654b404f2a222f918af9b0cd18ad469d0c941a8e.zip
op-kernel-dev-654b404f2a222f918af9b0cd18ad469d0c941a8e.tar.gz
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')
-rw-r--r--drivers/usb/serial/io_ti.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/serial/io_ti.c b/drivers/usb/serial/io_ti.c
index 4561dd4..a76b95d 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);
OpenPOWER on IntegriCloud