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asix: Fix small memory leak in ax88772_unbind()

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When Ethernet frames span mulitple URBs, the netdev buffer memory
pointed to by the asix_rx_fixup_info structure remains allocated
during the time gap between the 2 executions of asix_rx_fixup_internal().

This means that if ax88772_unbind() is called within this time
gap to free the memory of the parent private data structure then
a memory leak of the part filled netdev buffer memory will occur.

Therefore, create a new function asix_rx_fixup_common_free() to
free the memory of the netdev buffer and add a call to
asix_rx_fixup_common_free() from inside ax88772_unbind().

Consequently when an unbind occurs part way through receiving
an Ethernet frame, the netdev buffer memory that is holding part
of the received Ethernet frame will now be freed.

Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dean Jenkins 2017-08-07 09:50:16 +01:00 committed by David S. Miller
parent 960eb4eeaa
commit d0c8f338ab
3 changed files with 17 additions and 0 deletions
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1
drivers/net/usb/asix.h
View File

@ -209,6 +209,7 @@ void asix_write_cmd_async(struct usbnet *dev, u8 cmd, u16 value,
int asix_rx_fixup_internal(struct usbnet *dev, struct sk_buff *skb,
struct asix_rx_fixup_info *rx);
int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb);
void asix_rx_fixup_common_free(struct asix_common_private *dp);
struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
gfp_t flags);

15
drivers/net/usb/asix_common.c
View File

@ -210,6 +210,21 @@ int asix_rx_fixup_common(struct usbnet *dev, struct sk_buff *skb)
return asix_rx_fixup_internal(dev, skb, rx);
}
void asix_rx_fixup_common_free(struct asix_common_private *dp)
{
struct asix_rx_fixup_info *rx;
if (!dp)
return;
rx = &dp->rx_fixup_info;
if (rx->ax_skb) {
kfree_skb(rx->ax_skb);
rx->ax_skb = NULL;
}
}
struct sk_buff *asix_tx_fixup(struct usbnet *dev, struct sk_buff *skb,
gfp_t flags)
{

1
drivers/net/usb/asix_devices.c
View File

@ -764,6 +764,7 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf)
{
asix_rx_fixup_common_free(dev->driver_priv);
kfree(dev->driver_priv);
}