4.14-stable review patch. If anyone has any objections, please let me know.
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From: Shuah Khan shuahkh@osg.samsung.com
commit 5fd77a3a0e408c23ab4002a57db980e46bc16e72 upstream.
v_send_ret_submit() handles urb with a 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.
Signed-off-by: Shuah Khan shuahkh@osg.samsung.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/usbip/vudc_tx.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-)
--- a/drivers/usb/usbip/vudc_tx.c +++ b/drivers/usb/usbip/vudc_tx.c @@ -97,6 +97,13 @@ static int v_send_ret_submit(struct vudc memset(&pdu_header, 0, sizeof(pdu_header)); memset(&msg, 0, sizeof(msg));
+ if (urb->actual_length > 0 && !urb->transfer_buffer) { + dev_err(&udc->gadget.dev, + "urb: actual_length %d transfer_buffer null\n", + urb->actual_length); + return -1; + } + if (urb_p->type == USB_ENDPOINT_XFER_ISOC) iovnum = 2 + urb->number_of_packets; else @@ -112,8 +119,8 @@ static int v_send_ret_submit(struct vudc
/* 1. setup usbip_header */ setup_ret_submit_pdu(&pdu_header, urb_p); - usbip_dbg_stub_tx("setup txdata seqnum: %d urb: %p\n", - pdu_header.base.seqnum, urb); + usbip_dbg_stub_tx("setup txdata seqnum: %d\n", + pdu_header.base.seqnum); usbip_header_correct_endian(&pdu_header, 1);
iov[iovnum].iov_base = &pdu_header;