39 lines
1.2 KiB
Diff
39 lines
1.2 KiB
Diff
From 6bc6895bdd6744e0136eaa4a11fbdb20a7db4e40 Mon Sep 17 00:00:00 2001
|
|
From: Eric Dumazet <edumazet@google.com>
|
|
Date: Wed, 19 Apr 2017 09:59:25 -0700
|
|
Subject: [PATCH] ch9200: use skb_cow_head() to deal with cloned skbs
|
|
|
|
We need to ensure there is enough headroom to push extra header,
|
|
but we also need to check if we are allowed to change headers.
|
|
|
|
skb_cow_head() is the proper helper to deal with this.
|
|
|
|
Fixes: 4a476bd6d1d9 ("usbnet: New driver for QinHeng CH9200 devices")
|
|
Signed-off-by: Eric Dumazet <edumazet@google.com>
|
|
Cc: James Hughes <james.hughes@raspberrypi.org>
|
|
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
drivers/net/usb/ch9200.c | 9 ++-------
|
|
1 file changed, 2 insertions(+), 7 deletions(-)
|
|
|
|
--- a/drivers/net/usb/ch9200.c
|
|
+++ b/drivers/net/usb/ch9200.c
|
|
@@ -254,14 +254,9 @@ static struct sk_buff *ch9200_tx_fixup(s
|
|
tx_overhead = 0x40;
|
|
|
|
len = skb->len;
|
|
- if (skb_headroom(skb) < tx_overhead) {
|
|
- struct sk_buff *skb2;
|
|
-
|
|
- skb2 = skb_copy_expand(skb, tx_overhead, 0, flags);
|
|
+ if (skb_cow_head(skb, tx_overhead)) {
|
|
dev_kfree_skb_any(skb);
|
|
- skb = skb2;
|
|
- if (!skb)
|
|
- return NULL;
|
|
+ return NULL;
|
|
}
|
|
|
|
__skb_push(skb, tx_overhead);
|