3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jason Wang <jasowang@xxxxxxxxxx> commit b92946e2919134ebe2a4083e4302236295ea2a73 upstream. There're several reasons that the vectors need to be validated: - Return error when caller provides vectors whose num is greater than UIO_MAXIOV. - Linearize part of skb when userspace provides vectors grater than MAX_SKB_FRAGS. - Return error when userspace provides vectors whose total length may exceed - MAX_SKB_FRAGS * PAGE_SIZE. Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx> Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx> Signed-off-by: Benjamin Poirier <bpoirier@xxxxxxx> [patch reduced to the 3rd reason only for 3.0] Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/net/macvtap.c | 4 ++++ 1 file changed, 4 insertions(+) --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -552,6 +552,10 @@ static ssize_t macvtap_get_user(struct m if (unlikely(len < ETH_HLEN)) goto err; + err = -EMSGSIZE; + if (unlikely(count > UIO_MAXIOV)) + goto err; + skb = macvtap_alloc_skb(&q->sk, NET_IP_ALIGN, len, vnet_hdr.hdr_len, noblock, &err); if (!skb) -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html