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authorShuah Khan <shuahkh@osg.samsung.com>2017-12-07 14:16:50 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-12-08 17:32:23 +0100
commitbe6123df1ea8f01ee2f896a16c2b7be3e4557a5a (patch)
tree7b2addc6d11ceacdd9e595c4cc8f84ac8f11aa68 /drivers/usb/usbip
parent2f2d0088eb93db5c649d2a5e34a3800a8a935fc5 (diff)
downloadlinux-be6123df1ea8f01ee2f896a16c2b7be3e4557a5a.tar.bz2
usbip: fix stub_send_ret_submit() vulnerability to null transfer_buffer
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> Cc: stable <stable@vger.kernel.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/usbip')
-rw-r--r--drivers/usb/usbip/stub_tx.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/usbip/stub_tx.c b/drivers/usb/usbip/stub_tx.c
index b18bce96c212..53172b1f6257 100644
--- a/drivers/usb/usbip/stub_tx.c
+++ b/drivers/usb/usbip/stub_tx.c
@@ -167,6 +167,13 @@ 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