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authorSoheil Hassas Yeganeh <soheil@google.com>2019-03-06 13:01:36 -0500
committerDavid S. Miller <davem@davemloft.net>2019-03-06 11:00:50 -0800
commit6466e715651f9f358e60c5ea4880e4731325827f (patch)
treeb7becb9ea1b8fd50abbca27ddd36c0b379485b0a /drivers/net/ethernet/renesas/ravb_main.c
parentnet: hsr: fix memory leak in hsr_dev_finalize() (diff)
downloadlinux-dev-6466e715651f9f358e60c5ea4880e4731325827f.tar.xz
linux-dev-6466e715651f9f358e60c5ea4880e4731325827f.zip
tcp: do not report TCP_CM_INQ of 0 for closed connections
Returning 0 as inq to userspace indicates there is no more data to read, and the application needs to wait for EPOLLIN. For a connection that has received FIN from the remote peer, however, the application must continue reading until getting EOF (return value of 0 from tcp_recvmsg) or an error, if edge-triggered epoll (EPOLLET) is being used. Otherwise, the application will never receive a new EPOLLIN, since there is no epoll edge after the FIN. Return 1 when there is no data left on the queue but the connection has received FIN, so that the applications continue reading. Fixes: b75eba76d3d72 (tcp: send in-queue bytes in cmsg upon read) Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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