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virtio_net: fix memory leak inside XPD_TX with mergeable

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commit 7a542bee27 upstream.

When we call xdp_convert_buff_to_frame() to get xdpf, if it returns
NULL, we should check if xdp_page was allocated by xdp_linearize_page().
If it is newly allocated, it should be freed here alone. Just like any
other "goto err_xdp".

Fixes: 44fa2dbd47 ("xdp: transition into using xdp_frame for ndo_xdp_xmit")
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xuan Zhuo 2022-08-04 14:32:48 +08:00 • committed by Justin Hammond
parent 8980cf2e8b
commit 9cafd8e8c1
1 changed files with 4 additions and 1 deletions
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5
drivers/net/virtio_net.c
View file

@ -1017,8 +1017,11 @@ static struct sk_buff *receive_mergeable(struct net_device *dev,
case XDP_TX:
stats->xdp_tx++;
xdpf = xdp_convert_buff_to_frame(&xdp);
if (unlikely(!xdpf))
if (unlikely(!xdpf)) {
if (unlikely(xdp_page != page))
put_page(xdp_page);
goto err_xdp;
}
err = virtnet_xdp_xmit(dev, 1, &xdpf, 0);
if (unlikely(!err)) {
xdp_return_frame_rx_napi(xdpf);