AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/net/mptcp
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Paolo Abeni 5ab779a68e mptcp: do not wakeup listener for MPJ subflows 
commit 52557dbc7538ecceb27ef2206719a47a8039a335 upstream.

MPJ subflows are not exposed as fds to user spaces. As such,
incoming MPJ subflows are removed from the accept queue by
tcp_check_req()/tcp_get_cookie_sock().

Later tcp_child_process() invokes subflow_data_ready() on the
parent socket regardless of the subflow kind, leading to poll
wakeups even if the later accept will block.

Address the issue by double-checking the queue state before
waking the user-space.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/164
Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Fixes: f296234c98 ("mptcp: Add handling of incoming MP_JOIN requests")
Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-03-07 12:34:06 +01:00
..
crypto_test.c
crypto.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-08-05 20:13:21 -07:00
ctrl.c mptcp: enable JOIN requests even if cookies are in use 2020-07-31 16:55:32 -07:00
diag.c
Kconfig mptcp: depends on IPV6 but not as a module 2020-10-21 08:05:40 -07:00
Makefile mptcp: enable JOIN requests even if cookies are in use 2020-07-31 16:55:32 -07:00
mib.c mptcp: print new line in mptcp_seq_show() if mptcp isn't in use 2020-12-07 17:45:29 -08:00
mib.h mptcp: add RM_ADDR related mibs 2020-09-24 19:58:34 -07:00
mptcp_diag.c
options.c mptcp: move mptcp_options_received's port initialization 2020-10-20 16:32:36 -07:00
pm_netlink.c mptcp: Constify mptcp_pm_ops 2020-10-04 21:13:36 -07:00
pm.c mptcp: ADD_ADDRs with echo bit are smaller 2020-10-03 17:36:37 -07:00
protocol.c mptcp: skip to next candidate if subflow has unacked data 2021-02-23 15:53:23 +01:00
protocol.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-10-15 12:43:21 -07:00
subflow.c mptcp: do not wakeup listener for MPJ subflows 2021-03-07 12:34:06 +01:00
syncookies.c mptcp: fix syncookie build error on UP 2020-08-01 11:52:55 -07:00
token_test.c
token.c mptcp: token: fix unititialized variable 2020-11-03 13:08:30 -08:00