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Subjectskbuff: Fix checksum start check in skb_postpull_rcsum
In skb_postpull_rcsum the skb has already been pulled so we should
be testing whether the checksum start offset is non-negative rather
than how it compares to the length that we have pulled.

Fixes: 6ae459bdaaee ("skbuff: Fix skb checksum flag on skb pull")
Reported-by: Mike Galbraith <umgwanakikbuti@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2b0a30a..4398411 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2708,7 +2708,7 @@ static inline void skb_postpull_rcsum(struct sk_buff *skb,
if (skb->ip_summed == CHECKSUM_COMPLETE)
skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0));
else if (skb->ip_summed == CHECKSUM_PARTIAL &&
- skb_checksum_start_offset(skb) <= len)
+ skb_checksum_start_offset(skb) < 0)
skb->ip_summed = CHECKSUM_NONE;
}

--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

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