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From e330568504ec379ea42460d21a2e20b1652d9445 Mon Sep 17 00:00:00 2001
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From: Reid Wahl <nrwahl@protonmail.com>
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Date: Fri, 14 Jan 2022 01:35:35 -0800
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Subject: [PATCH] Fix: fencing: Don't set stonith action to pending if fork
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fails
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Currently, we set a stonith action to pending if
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services_action_async_fork_notify() returns true. However, "true" means
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that the svc_action should not be freed. This might be because the
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svc_action forked successfully and is pending, or it might be because
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the svc_action has already been freed.
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In the case of stonith actions, if we fail to fork, the stonith_action_t
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object stored in svc_action->cb_data gets freed by the done callback,
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and services_action_async_fork_notify() returns true. If we try to set
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the action to pending, it causes a segfault.
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This commit moves the "set to pending" step to the
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stonith_action_async_forked() callback. We avoid the segfault and only
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set it to pending if it's actually pending.
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A slight difference in ordering was required to achieve this. Now, the
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action gets set to pending immediately before being added to the
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mainloop, instead of immediately after.
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Signed-off-by: Reid Wahl <nrwahl@protonmail.com>
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---
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lib/fencing/st_actions.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/lib/fencing/st_actions.c b/lib/fencing/st_actions.c
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index e4e43225cd..306001af69 100644
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--- a/lib/fencing/st_actions.c
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+++ b/lib/fencing/st_actions.c
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@@ -550,6 +550,9 @@ stonith_action_async_forked(svc_action_t *svc_action)
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(action->fork_cb) (svc_action->pid, action->userdata);
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}
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+ pcmk__set_result(&(action->result), PCMK_OCF_UNKNOWN, PCMK_EXEC_PENDING,
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+ NULL);
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+
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crm_trace("Child process %d performing action '%s' successfully forked",
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action->pid, action->action);
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}
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@@ -619,8 +622,6 @@ internal_stonith_action_execute(stonith_action_t * action)
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if (services_action_async_fork_notify(svc_action,
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&stonith_action_async_done,
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&stonith_action_async_forked)) {
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- pcmk__set_result(&(action->result), PCMK_OCF_UNKNOWN,
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- PCMK_EXEC_PENDING, NULL);
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return pcmk_ok;
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}
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--
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2.27.0
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