gro: Only reset frag0 when skb can be pulled
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>
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