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Message-Id: <20170425140809.23881-5-Jason@zx2c4.com>
Date: Tue, 25 Apr 2017 16:08:09 +0200
From: "Jason A. Donenfeld" <Jason@...c4.com>
To: netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
davem@...emloft.net,
David.Laight@...lab.com,
kernel-hardening@...ts.openwall.com
Cc: "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH 5/5] virtio_net: check return value of skb_to_sgvec always
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
drivers/net/virtio_net.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index f36584616e7d..1709fd0b4bf7 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -1081,7 +1081,7 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
struct virtio_net_hdr_mrg_rxbuf *hdr;
const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
struct virtnet_info *vi = sq->vq->vdev->priv;
- unsigned num_sg;
+ int num_sg;
unsigned hdr_len = vi->hdr_len;
bool can_push;
@@ -1114,6 +1114,8 @@ static int xmit_skb(struct send_queue *sq, struct sk_buff *skb)
sg_set_buf(sq->sg, hdr, hdr_len);
num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
}
+ if (unlikely(num_sg < 0))
+ return num_sg;
return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
}
--
2.12.2
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