Commit 7db174dd authored by Marc Zyngier's avatar Marc Zyngier Committed by Luis Henriques

net: sun4i-emac: fix memory leak on bad packet

commit 2670cc69 upstream.

Upon reception of a new frame, the emac driver checks for a number
of error conditions, and flag the packet as "bad" if any of these
are present. It then allocates a skb unconditionally, but only uses
it if the packet is "good". On the error path, the skb is just forgotten,
and the system leaks memory.

The piece of junk I have on my desk seems to encounter such error
frequently enough so that the box goes OOM after a couple of days,
which makes me grumpy.

Fix this by moving the allocation on the "good_packet" path (and
convert it to netdev_alloc_skb while we're at it).

Tested on a random Allwinner A20 board.

Cc: Stefan Roese <sr@denx.de>
Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent b846edb5
......@@ -633,8 +633,10 @@ static void emac_rx(struct net_device *dev)
}
/* Move data from EMAC */
skb = dev_alloc_skb(rxlen + 4);
if (good_packet && skb) {
if (good_packet) {
skb = netdev_alloc_skb(dev, rxlen + 4);
if (!skb)
continue;
skb_reserve(skb, 2);
rdptr = (u8 *) skb_put(skb, rxlen - 4);
......
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