diff options
| author | Hui Peng <benquike@gmail.com> | 2018-12-12 12:42:24 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-12 15:41:10 -0800 |
| commit | 5146f95df782b0ac61abde36567e718692725c89 (patch) | |
| tree | a39915852a2990cf5ef7e4eea9824ddbe6abb0db /drivers/net/usb/hso.c | |
| parent | ee28b30cbbe0b490f52ba222c9d392b99581545e (diff) | |
USB: hso: Fix OOB memory access in hso_probe/hso_get_config_data
The function hso_probe reads if_num from the USB device (as an u8) and uses
it without a length check to index an array, resulting in an OOB memory read
in hso_probe or hso_get_config_data.
Add a length check for both locations and updated hso_probe to bail on
error.
This issue has been assigned CVE-2018-19985.
Reported-by: Hui Peng <benquike@gmail.com>
Reported-by: Mathias Payer <mathias.payer@nebelwelt.net>
Signed-off-by: Hui Peng <benquike@gmail.com>
Signed-off-by: Mathias Payer <mathias.payer@nebelwelt.net>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/usb/hso.c')
| -rw-r--r-- | drivers/net/usb/hso.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/net/usb/hso.c b/drivers/net/usb/hso.c index 184c24baca15..d6916f787fce 100644 --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -2807,6 +2807,12 @@ static int hso_get_config_data(struct usb_interface *interface) return -EIO; } + /* check if we have a valid interface */ + if (if_num > 16) { + kfree(config_data); + return -EINVAL; + } + switch (config_data[if_num]) { case 0x0: result = 0; @@ -2877,10 +2883,18 @@ static int hso_probe(struct usb_interface *interface, /* Get the interface/port specification from either driver_info or from * the device itself */ - if (id->driver_info) + if (id->driver_info) { + /* if_num is controlled by the device, driver_info is a 0 terminated + * array. Make sure, the access is in bounds! */ + for (i = 0; i <= if_num; ++i) + if (((u32 *)(id->driver_info))[i] == 0) + goto exit; port_spec = ((u32 *)(id->driver_info))[if_num]; - else + } else { port_spec = hso_get_config_data(interface); + if (port_spec < 0) + goto exit; + } /* Check if we need to switch to alt interfaces prior to port * configuration */ |