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Subject[05/55] gro: Only reset frag0 when skb can be pulled
2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------
From: Herbert Xu <herbert@gondor.apana.org.au>

commit 17dd759c67f21e34f2156abcf415e1f60605a188 upstream.

Currently skb_gro_header_slow unconditionally resets frag0 and
frag0_len. However, when we can't pull on the skb this leaves
the GRO fields in an inconsistent state.

This patch fixes this by only resetting those fields after the
pskb_may_pull test.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
include/linux/netdevice.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1164,9 +1164,12 @@ static inline int skb_gro_header_hard(st
static inline void *skb_gro_header_slow(struct sk_buff *skb, unsigned int hlen,
unsigned int offset)
{
+ if (!pskb_may_pull(skb, hlen))
+ return NULL;
+
NAPI_GRO_CB(skb)->frag0 = NULL;
NAPI_GRO_CB(skb)->frag0_len = 0;
- return pskb_may_pull(skb, hlen) ? skb->data + offset : NULL;
+ return skb->data + offset;
}

static inline void *skb_gro_mac_header(struct sk_buff *skb)



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