From: Oliver Neukum oneukum@suse.com
commit e9da0b56fe27206b49f39805f7dcda8a89379062 upstream.
A malicious device can leak heap data to user space providing bogus frame lengths. Introduce a sanity check.
Signed-off-by: Oliver Neukum oneukum@suse.com Reviewed-by: Grant Grundler grundler@chromium.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/usb/sr9700.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/usb/sr9700.c +++ b/drivers/net/usb/sr9700.c @@ -413,7 +413,7 @@ static int sr9700_rx_fixup(struct usbnet /* ignore the CRC length */ len = (skb->data[1] | (skb->data[2] << 8)) - 4;
- if (len > ETH_FRAME_LEN) + if (len > ETH_FRAME_LEN || len > skb->len) return 0;
/* the last packet of current skb */