virtio-net: Verify page list size before fitting into skb
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@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: virtualization@lists.linux-foundation.org Cc: netdev@vger.kernel.org Cc: kvm@vger.kernel.org Signed-off-by: Sasha Levin <levinsasha928@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -195,6 +195,19 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
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len -= copy;
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offset += copy;
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/*
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* Verify that we can indeed put this data into a skb.
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* This is here to handle cases when the device erroneously
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* tries to receive more than is possible. This is usually
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* the case of a broken device.
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*/
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if (unlikely(len > MAX_SKB_FRAGS * PAGE_SIZE)) {
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if (net_ratelimit())
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pr_debug("%s: too much data\n", skb->dev->name);
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dev_kfree_skb(skb);
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return NULL;
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}
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while (len) {
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set_skb_frag(skb, page, offset, &len);
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page = (struct page *)page->private;
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