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selftests: mptcp: add test for extra_subflows underflow on userspace PM

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commit 06fd2bec7a upstream.

Add a test to verify that when userspace PM fails to create a subflow
(e.g. using an unreachable address), the extra_subflows counter is not
decremented below zero.

Fixes: 77e4b94a3d ("mptcp: update userspace pm infos")
Cc: stable@vger.kernel.org
Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20260602-net-mptcp-misc-fixes-7-1-rc7-v2-6-856831229976@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tao Cui
2026-06-19 13:39:33 +02:00
committed by Greg Kroah-Hartman
parent 026c4a70e2
commit eb13ab2f66
1 changed files with 4 additions and 0 deletions
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tools/testing/selftests/net/mptcp/mptcp_join.sh
+4
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@@ -3774,6 +3774,10 @@ userspace_tests()
chk_rm_nr 0 1
chk_mptcp_info subflows 0 subflows 0
chk_subflows_total 1 1
# check counters are not affected by errors at creation time
userspace_pm_add_sf $ns2 10.0.12.2 10 2>/dev/null
chk_mptcp_info subflows 0 subflows 0
chk_subflows_total 1 1
kill_events_pids
mptcp_lib_kill_group_wait $tests_pid
fi