linux-kernel - [PATCH 1/2] virtio-net: Verify page list size before fitting into skb

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Message-Id: <1317058869-19276-1-git-send-email-levinsasha928@gmail.com>
Date:	Mon, 26 Sep 2011 20:41:08 +0300
From:	Sasha Levin <levinsasha928@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Sasha Levin <levinsasha928@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	kvm@...r.kernel.org
Subject: [PATCH 1/2] 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@...tcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@...hat.com>
Cc: virtualization@...ts.linux-foundation.org
Cc: netdev@...r.kernel.org
Cc: kvm@...r.kernel.org
Signed-off-by: Sasha Levin <levinsasha928@...il.com>
---
 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

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