[PATCH RFC] virtio_net: fix mergeable bufs error handling

From: Michael S. Tsirkin
Date: Fri Mar 10 2017 - 11:18:02 EST

On xdp error we try to free head_skb without having
initialized it, that's clearly bogus.

Fixes: f600b6905015 ("virtio_net: Add XDP support")
Cc: John Fastabend <john.fastabend@xxxxxxxxx>
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>

I'm cleaning up a bunch of issues in this code, thus
RFC, will test and post it all together.

drivers/net/virtio_net.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 11773d6..e0fb3707 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -570,7 +570,7 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
u16 num_buf;
struct page *page;
int offset;
- struct sk_buff *head_skb, *curr_skb;
+ struct sk_buff *head_skb = NULL, *curr_skb;
struct bpf_prog *xdp_prog;
unsigned int truesize;