kernel: split patches folder up into backport, pending and hack folders

[openwrt/openwrt.git] / target / linux / generic / backport-4.9 / 023-2-smsc75xx-use-skb_cow_head-to-deal-with-cloned-skbs.patch

diff --git a/target/linux/generic/backport-4.9/023-2-smsc75xx-use-skb_cow_head-to-deal-with-cloned-skbs.patch b/target/linux/generic/backport-4.9/023-2-smsc75xx-use-skb_cow_head-to-deal-with-cloned-skbs.patch
new file mode 100644 (file)
index 0000000..99d98e1
--- /dev/null
+++ b/target/linux/generic/backport-4.9/023-2-smsc75xx-use-skb_cow_head-to-deal-with-cloned-skbs.patch
@@ -0,0 +1,36 @@
+From b7c6d2675899cfff0180412c63fc9cbd5bacdb4d Mon Sep 17 00:00:00 2001
+From: Eric Dumazet <edumazet@google.com>
+Date: Wed, 19 Apr 2017 09:59:21 -0700
+Subject: [PATCH] smsc75xx: 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: d0cad871703b ("smsc75xx: SMSC LAN75xx USB gigabit ethernet adapter driver")
+Signed-off-by: Eric Dumazet <edumazet@google.com>
+Cc: James Hughes <james.hughes@raspberrypi.org>
+Signed-off-by: David S. Miller <davem@davemloft.net>
+---
+ drivers/net/usb/smsc75xx.c | 8 ++------
+ 1 file changed, 2 insertions(+), 6 deletions(-)
+
+--- a/drivers/net/usb/smsc75xx.c
++++ b/drivers/net/usb/smsc75xx.c
+@@ -2205,13 +2205,9 @@ static struct sk_buff *smsc75xx_tx_fixup
+ {
+       u32 tx_cmd_a, tx_cmd_b;
+ 
+-      if (skb_headroom(skb) < SMSC75XX_TX_OVERHEAD) {
+-              struct sk_buff *skb2 =
+-                      skb_copy_expand(skb, SMSC75XX_TX_OVERHEAD, 0, flags);
++      if (skb_cow_head(skb, SMSC75XX_TX_OVERHEAD)) {
+               dev_kfree_skb_any(skb);
+-              skb = skb2;
+-              if (!skb)
+-                      return NULL;
++              return NULL;
+       }
+ 
+       tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;