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From 8f1df942e2237124f7559176081af7ac631d3422 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Tue, 13 Feb 2018 23:57:43 +0100
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Subject: [PATCH] pid1: properly remove references to the unit from gc queue
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during final cleanup
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When various references to the unit were dropped during cleanup in unit_free(),
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add_to_gc_queue() could be called on this unit. If the unit was previously in
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the gc queue (at the time when unit_free() was called on it), this wouldn't
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matter, because it'd have in_gc_queue still set even though it was already
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removed from the queue. But if it wasn't set, then the unit could be added to
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the queue. Then after unit_free() would deallocate the unit, we would be left
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with a dangling pointer in gc_queue.
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A unit could be added to the gc queue in two places called from unit_free():
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in the job_install calls, and in unit_ref_unset(). The first was OK, because
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it was above the LIST_REMOVE(gc_queue,...) call, but the second was not, because
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it was after that. Move the all LIST_REMOVE() calls down.
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(cherry picked from commit 1bdf2790025e661e41894129eb390bb032b88585)
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Related: #1718953
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---
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src/core/unit.c | 34 +++++++++++++++++-----------------
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1 file changed, 17 insertions(+), 17 deletions(-)
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diff --git a/src/core/unit.c b/src/core/unit.c
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index 63f00acc0a..def36a0930 100644
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--- a/src/core/unit.c
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+++ b/src/core/unit.c
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@@ -506,23 +506,6 @@ void unit_free(Unit *u) {
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for (d = 0; d < _UNIT_DEPENDENCY_MAX; d++)
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bidi_set_free(u, u->dependencies[d]);
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- if (u->type != _UNIT_TYPE_INVALID)
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- LIST_REMOVE(units_by_type, u->manager->units_by_type[u->type], u);
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-
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- if (u->in_load_queue)
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- LIST_REMOVE(load_queue, u->manager->load_queue, u);
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-
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- if (u->in_dbus_queue)
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- LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
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-
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- if (u->in_cleanup_queue)
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- LIST_REMOVE(cleanup_queue, u->manager->cleanup_queue, u);
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-
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- if (u->in_gc_queue) {
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- LIST_REMOVE(gc_queue, u->manager->gc_queue, u);
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- u->manager->n_in_gc_queue--;
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- }
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-
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if (u->in_target_deps_queue)
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LIST_REMOVE(target_deps_queue, u->manager->target_deps_queue, u);
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@@ -543,6 +526,23 @@ void unit_free(Unit *u) {
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while (u->refs_by_target)
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unit_ref_unset(u->refs_by_target);
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+ if (u->type != _UNIT_TYPE_INVALID)
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+ LIST_REMOVE(units_by_type, u->manager->units_by_type[u->type], u);
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+
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+ if (u->in_load_queue)
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+ LIST_REMOVE(load_queue, u->manager->load_queue, u);
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+
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+ if (u->in_dbus_queue)
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+ LIST_REMOVE(dbus_queue, u->manager->dbus_unit_queue, u);
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+
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+ if (u->in_cleanup_queue)
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+ LIST_REMOVE(cleanup_queue, u->manager->cleanup_queue, u);
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+
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+ if (u->in_gc_queue) {
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+ LIST_REMOVE(gc_queue, u->manager->gc_queue, u);
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+ u->manager->n_in_gc_queue--;
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+ }
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+
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condition_free_list(u->conditions);
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condition_free_list(u->asserts);
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