diff options
| author | Shuah Khan <shuahkh@osg.samsung.com> | 2017-12-07 14:16:50 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-20 10:07:16 +0100 |
| commit | 14513e49c43cd3149a03ff9e1c223c3d5803ad09 (patch) | |
| tree | 6bb9cec0e1587943a306e9eb8bdbf354e3b2fc1c | |
| parent | f3e957266ae56c200fb13a42309c50f84576c64a (diff) | |
usbip: fix stub_send_ret_submit() vulnerability to null transfer_buffer
commit be6123df1ea8f01ee2f896a16c2b7be3e4557a5a upstream.
stub_send_ret_submit() handles urb with a potential null transfer_buffer,
when it replays a packet with potential malicious data that could contain
a null buffer. Add a check for the condition when actual_length > 0 and
transfer_buffer is null.
Reported-by: Secunia Research <vuln@secunia.com>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/usbip/stub_tx.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/usbip/stub_tx.c b/drivers/usb/usbip/stub_tx.c index be50cef645d8..87ff94be4235 100644 --- a/drivers/usb/usbip/stub_tx.c +++ b/drivers/usb/usbip/stub_tx.c @@ -181,6 +181,13 @@ static int stub_send_ret_submit(struct stub_device *sdev) memset(&pdu_header, 0, sizeof(pdu_header)); memset(&msg, 0, sizeof(msg)); + if (urb->actual_length > 0 && !urb->transfer_buffer) { + dev_err(&sdev->udev->dev, + "urb: actual_length %d transfer_buffer null\n", + urb->actual_length); + return -1; + } + if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) iovnum = 2 + urb->number_of_packets; else |