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net: usb: asix: Fix crash on skb alloc failure

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If asix_rx_fixup_internal() fails to allocate rx->ax_skb, it will return
but not clear rx->size. rx points to driver private data. A later call
assumes that nonzero size means ax_skb was allocated and passes a null
ax_skb to skb_put. Changed allocation failure return to clear size first.

Found testing board with AX88772B devices.

Signed-off-by: David B. Robins <linux@davidrobins.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David B. Robins 2015-09-30 16:20:04 -04:00 committed by David S. Miller
parent 74910ea49d
commit f6194bcf03
1 changed files with 3 additions and 1 deletions
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4
drivers/net/usb/asix_common.c
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@ -91,8 +91,10 @@ int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
} }
rx->ax_skb = netdev_alloc_skb_ip_align(dev->net, rx->ax_skb = netdev_alloc_skb_ip_align(dev->net,
rx->size); rx->size);
if (!rx->ax_skb) if (!rx->ax_skb) {
rx->size = 0;
return 0; return 0;
}
} }
if (rx->size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) { if (rx->size > dev->net->mtu + ETH_HLEN + VLAN_HLEN) {