This is a note to let you know that I've just added the patch titled
virtio_net: check return value of skb_to_sgvec always
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
virtio_net-check-return-value-of-skb_to_sgvec-always.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e2fcad58fd230f635a74e4e983c6f4ea893642d2 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Sun, 4 Jun 2017 04:16:26 +0200
Subject: virtio_net: check return value of skb_to_sgvec always
From: Jason A. Donenfeld <Jason@xxxxxxxxx>
commit e2fcad58fd230f635a74e4e983c6f4ea893642d2 upstream.
Signed-off-by: Jason A. Donenfeld <Jason@xxxxxxxxx>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Jason Wang <jasowang@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
[natechancellor: backport to 4.4]
Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/virtio_net.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -858,7 +858,7 @@ static int xmit_skb(struct send_queue *s
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;
@@ -911,11 +911,16 @@ static int xmit_skb(struct send_queue *s
if (can_push) {
__skb_push(skb, hdr_len);
num_sg = skb_to_sgvec(skb, sq->sg, 0, skb->len);
+ if (unlikely(num_sg < 0))
+ return num_sg;
/* Pull header back to avoid skew in tx bytes calculations. */
__skb_pull(skb, hdr_len);
} else {
sg_set_buf(sq->sg, hdr, hdr_len);
- num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len) + 1;
+ num_sg = skb_to_sgvec(skb, sq->sg + 1, 0, skb->len);
+ if (unlikely(num_sg < 0))
+ return num_sg;
+ num_sg++;
}
return virtqueue_add_outbuf(sq->vq, sq->sg, num_sg, skb, GFP_ATOMIC);
}
Patches currently in stable-queue which might be from Jason@xxxxxxxxx are
queue-4.4/ipsec-check-return-value-of-skb_to_sgvec-always.patch
queue-4.4/skbuff-return-emsgsize-in-skb_to_sgvec-to-prevent-overflow.patch
queue-4.4/rxrpc-check-return-value-of-skb_to_sgvec-always.patch
queue-4.4/virtio_net-check-return-value-of-skb_to_sgvec-always.patch
queue-4.4/virtio_net-check-return-value-of-skb_to_sgvec-in-one-more-location.patch