udp: Fix udp_poll() and ioctl()
udp_poll() can in some circumstances drop frames with incorrect checksums. Problem is we now have to lock the socket while dropping frames, or risk sk_forward corruption. This bug is present since commit 95766fff ([UDP]: Add memory accounting.) While we are at it, we can correct ioctl(SIOCINQ) to also drop bad frames. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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