From: James Hughes <james.hug...@raspberrypi.org>
commit e9156cd26a495a18706e796f02a81fee41ec14f4 upstream.
The driver was failing to check that the SKB wasn't cloned
before adding checksum data.
Replace existing handling to extend/copy the header buffer
with skb_cow_head.
Signed-off-by: James Hughes <james.hug...@raspberrypi.org>
Acked-by: Eric Dumazet <eduma...@google.com>
Acked-by: Woojung Huh <woojung....@microchip.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
---
- This was applied upstream in v4.11
- Should be applied to stable v4.9.y
---
drivers/net/usb/smsc95xx.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
index e29f4c0767eb..e719ecd69d01 100644
--- a/drivers/net/usb/smsc95xx.c
+++ b/drivers/net/usb/smsc95xx.c
@@ -2011,13 +2011,13 @@ static struct sk_buff *smsc95xx_tx_fixup(struct usbnet
*dev,
/* We do not advertise SG, so skbs should be already linearized */
BUG_ON(skb_shinfo(skb)->nr_frags);
- if (skb_headroom(skb) < overhead) {
- struct sk_buff *skb2 = skb_copy_expand(skb,
- overhead, 0, flags);
+ /* Make writable and expand header space by overhead if required */
+ if (skb_cow_head(skb, overhead)) {
+ /* Must deallocate here as returning NULL to indicate error
+ * means the skb won't be deallocated in the caller.
+ */
dev_kfree_skb_any(skb);
- skb = skb2;
- if (!skb)
- return NULL;
+ return NULL;
}
if (csum) {
--
2.20.1
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