tree dd3d30a25e69fa94dcffa024e5a87758c0f6ba24
parent 2fbe43f6f631dd7ce19fb1499d6164a5bdb34568
author Herbert Xu <herbert@gondor.apana.org.au> 1189083995 +0100
committer David S. Miller <davem@kimchee.(none)> 1189499347 +0200

[NET]: Do not dereference iov if length is zero

When msg_iovlen is zero we shouldn't try to dereference
msg_iov.  Right now the only thing that tries to do so
is skb_copy_and_csum_datagram_iovec.  Since the total
length should also be zero if msg_iovlen is zero, it's
sufficient to check the total length there and simply
return if it's zero.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>