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af_rxrpc: Remove incorrect checksum calculation from rxrpc_recvmsg() 

The UDP checksum was already verified in rxrpc_data_ready() - which calls
skb_checksum_complete() - as the RxRPC packet header contains no checksum of
its own.  Subsequent calls to skb_copy_and_csum_datagram_iovec() are thus
redundant and are, in any case, being passed only a subset of the UDP payload -
so the checksum will always fail if that path is taken.

So there is no need to check skb->ip_summed in rxrpc_recvmsg(), and no need for
the csum_copy_error: exit path.

Signed-off-by: Tim Smith <tim@electronghost.co.uk>
Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
Tim Smith 2014-02-07 18:58:43 +00:00 committed by David Howells
parent 38dbfb59d1
commit 8961749e5f
1 changed files with 1 additions and 24 deletions
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25
net/rxrpc/ar-recvmsg.c
View File

@ -180,16 +180,7 @@ int rxrpc_recvmsg(struct kiocb *iocb, struct socket *sock,
if (copy > len - copied)
copy = len - copied;
if (skb->ip_summed == CHECKSUM_UNNECESSARY ||
skb->ip_summed == CHECKSUM_PARTIAL) {
ret = skb_copy_datagram_iovec(skb, offset,
msg->msg_iov, copy);
} else {
ret = skb_copy_and_csum_datagram_iovec(skb, offset,
msg->msg_iov);
if (ret == -EINVAL)
goto csum_copy_error;
}
ret = skb_copy_datagram_iovec(skb, offset, msg->msg_iov, copy);
if (ret < 0)
goto copy_error;
@ -348,20 +339,6 @@ copy_error:
_leave(" = %d", ret);
return ret;
csum_copy_error:
_debug("csum error");
release_sock(&rx->sk);
if (continue_call)
rxrpc_put_call(continue_call);
rxrpc_kill_skb(skb);
if (!(flags & MSG_PEEK)) {
if (skb_dequeue(&rx->sk.sk_receive_queue) != skb)
BUG();
}
skb_kill_datagram(&rx->sk, skb, flags);
rxrpc_put_call(call);
return -EAGAIN;
wait_interrupted:
ret = sock_intr_errno(timeo);
wait_error: