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| author | Marc Zyngier <marc.zyngier@arm.com> | 2014-08-05 16:44:39 +0100 |
|---|---|---|
| committer | Jiri Slaby <jslaby@suse.cz> | 2015-11-14 18:58:16 +0100 |
| commit | 8556e3af49a4bcc5bbfd3582a20a4e4163f8b455 (patch) | |
| tree | 3121494af2a4183f63a5f8b2f3ce53aded3df882 | |
| parent | 79f4fd24076c15fa1d59cc5dfa4646d550c3432b (diff) | |
| download | lwn-8556e3af49a4bcc5bbfd3582a20a4e4163f8b455.tar.gz lwn-8556e3af49a4bcc5bbfd3582a20a4e4163f8b455.zip | |
net: sun4i-emac: fix memory leak on bad packet
commit 2670cc699a66c4cf268cb3e3f6dfc325ec14f224 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: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
| -rw-r--r-- | drivers/net/ethernet/allwinner/sun4i-emac.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/ethernet/allwinner/sun4i-emac.c b/drivers/net/ethernet/allwinner/sun4i-emac.c index 81576c6c31e0..ac735537fe2e 100644 --- a/drivers/net/ethernet/allwinner/sun4i-emac.c +++ b/drivers/net/ethernet/allwinner/sun4i-emac.c @@ -623,8 +623,10 @@ 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); |