From: Dean Jenkins Date: Mon, 7 Aug 2017 08:50:14 +0000 (+0100) Subject: asix: Add rx->ax_skb = NULL after usbnet_skb_return() X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=22889dbbd98a0e3390e9120074c39c6e5a3fea5e;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git asix: Add rx->ax_skb = NULL after usbnet_skb_return() In asix_rx_fixup_internal() there is a risk that rx->ax_skb gets reused after passing the Ethernet frame into the network stack via usbnet_skb_return(). The risks include: a) asynchronously freeing rx->ax_skb after passing the netdev buffer to the NAPI layer which might corrupt the backlog queue. b) erroneously reusing rx->ax_skb such as calling skb_put_data() multiple times which causes writing off the end of the netdev buffer. Therefore add a defensive rx->ax_skb = NULL after usbnet_skb_return() so that it is not possible to free rx->ax_skb or to apply skb_put_data() too many times. Signed-off-by: Dean Jenkins Signed-off-by: David S. Miller --- diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c index 7847436c441e..6983b6bd8cf9 100644 --- a/drivers/net/usb/asix_common.c +++ b/drivers/net/usb/asix_common.c @@ -168,8 +168,10 @@ int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb, if (rx->ax_skb) { skb_put_data(rx->ax_skb, skb->data + offset, copy_length); - if (!rx->remaining) + if (!rx->remaining) { usbnet_skb_return(dev, rx->ax_skb); + rx->ax_skb = NULL; + } } offset += (copy_length + 1) & 0xfffe;