This patch verifies that the length of a buffer stored in a linked list of pages is small enough to fit into a skb. If the size is larger than a max size of a skb, it means that we shouldn't go ahead building skbs anyway since we won't be able to send the buffer as the user requested. Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx Cc: netdev@xxxxxxxxxxxxxxx Cc: kvm@xxxxxxxxxxxxxxx Signed-off-by: Sasha Levin <levinsasha928@xxxxxxxxx> --- drivers/net/virtio_net.c | 3 +++ 1 files changed, 3 insertions(+), 0 deletions(-) diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 0c7321c..64e0717 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -165,6 +165,9 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi, unsigned int copy, hdr_len, offset; char *p; + if (len > MAX_SKB_FRAGS * PAGE_SIZE) + return NULL; + p = page_address(page); /* copy small packet so we can reuse these pages for small data */ -- 1.7.6.1 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
