Fix a user-controlled slab buffer overflow due to a missing sanity check
on the bulk-out transfer buffer used for control requests.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/whiteheat.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 79314d8c94a4..76cabcb30d21 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -559,6 +559,10 @@ static int firm_send_command(struct usb_serial_port *port, __u8 command,
command_port = port->serial->port[COMMAND_PORT];
command_info = usb_get_serial_port_data(command_port);
+
+ if (command_port->bulk_out_size < datasize + 1)
+ return -EIO;
+
mutex_lock(&command_info->mutex);
command_info->command_finished = false;
--
2.23.0
