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base/SOURCES/0609-core-don-t-choke-if-a-...

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From d7b2f6efd02375af4cf043ef9db6d316b65d4779 Mon Sep 17 00:00:00 2001
From: Jan Synacek <jsynacek@redhat.com>
Date: Fri, 16 Feb 2018 09:56:50 +0100
Subject: [PATCH] core: don't choke if a unit another unit triggers vanishes
during reload
Fixes: #1981
(cherry picked from e903182e5b0daa941de47a9c08c824106cec7fe0)
Resolves: #1545676
---
src/core/automount.c | 25 +++++++++++++++++++++----
src/core/path.c | 18 +++++++++++++++---
src/core/timer.c | 30 ++++++++++++++++++++++++++----
3 files changed, 62 insertions(+), 11 deletions(-)
diff --git a/src/core/automount.c b/src/core/automount.c
index 182ba5240..679fe071e 100644
--- a/src/core/automount.c
+++ b/src/core/automount.c
@@ -715,6 +715,7 @@ static int automount_start_expire(Automount *a) {
static void automount_enter_running(Automount *a) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
struct stat st;
+ Unit *trigger;
int r;
assert(a);
@@ -753,8 +754,13 @@ static void automount_enter_running(Automount *a) {
return;
}
- r = manager_add_job(UNIT(a)->manager, JOB_START, UNIT_TRIGGER(UNIT(a)),
- JOB_REPLACE, true, &error, NULL);
+ trigger = UNIT_TRIGGER(UNIT(a));
+ if (!trigger) {
+ log_unit_error(UNIT(a)->id, "Unit to trigger vanished.");
+ goto fail;
+ }
+
+ r = manager_add_job(UNIT(a)->manager, JOB_START, trigger, JOB_REPLACE, true, &error, NULL);
if (r < 0) {
log_unit_warning(UNIT(a)->id,
"%s failed to queue mount startup job: %s",
@@ -775,6 +781,7 @@ fail:
static int automount_start(Unit *u) {
Automount *a = AUTOMOUNT(u);
+ Unit *trigger;
assert(a);
assert(a->state == AUTOMOUNT_DEAD || a->state == AUTOMOUNT_FAILED);
@@ -786,8 +793,11 @@ static int automount_start(Unit *u) {
return -EEXIST;
}
- if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
+ trigger = UNIT_TRIGGER(u);
+ if (!trigger || trigger->load_state != UNIT_LOADED) {
+ log_unit_error(u->id, "Refusing to start, unit to trigger not loaded.");
return -ENOENT;
+ }
a->result = AUTOMOUNT_SUCCESS;
automount_enter_waiting(a);
@@ -936,6 +946,7 @@ static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, vo
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
union autofs_v5_packet_union packet;
Automount *a = AUTOMOUNT(userdata);
+ Unit *trigger;
ssize_t l;
int r;
@@ -1002,7 +1013,13 @@ static int automount_dispatch_io(sd_event_source *s, int fd, uint32_t events, vo
log_unit_error_errno(UNIT(a)->id, r, "Failed to remember token: %m");
goto fail;
}
- r = manager_add_job(UNIT(a)->manager, JOB_STOP, UNIT_TRIGGER(UNIT(a)), JOB_REPLACE, true, &error, NULL);
+
+ trigger = UNIT_TRIGGER(UNIT(a));
+ if (!trigger) {
+ log_unit_error(UNIT(a)->id, "Unit to trigger vanished.");
+ goto fail;
+ }
+ r = manager_add_job(UNIT(a)->manager, JOB_STOP, trigger, JOB_REPLACE, true, &error, NULL);
if (r < 0) {
log_unit_warning(UNIT(a)->id,
"%s failed to queue umount startup job: %s",
diff --git a/src/core/path.c b/src/core/path.c
index 51e36fa8b..0533bb4e2 100644
--- a/src/core/path.c
+++ b/src/core/path.c
@@ -475,6 +475,7 @@ static void path_enter_dead(Path *p, PathResult f) {
static void path_enter_running(Path *p) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ Unit *trigger;
int r;
assert(p);
@@ -483,8 +484,14 @@ static void path_enter_running(Path *p) {
if (unit_stop_pending(UNIT(p)))
return;
- r = manager_add_job(UNIT(p)->manager, JOB_START, UNIT_TRIGGER(UNIT(p)),
- JOB_REPLACE, true, &error, NULL);
+ trigger = UNIT_TRIGGER(UNIT(p));
+ if (!trigger) {
+ log_unit_error(UNIT(p)->id, "Unit to trigger vanished.");
+ path_enter_dead(p, TIMER_FAILURE_RESOURCES);
+ return;
+ }
+
+ r = manager_add_job(UNIT(p)->manager, JOB_START, trigger, JOB_REPLACE, true, &error, NULL);
if (r < 0)
goto fail;
@@ -566,12 +573,17 @@ static void path_mkdir(Path *p) {
static int path_start(Unit *u) {
Path *p = PATH(u);
+ Unit *trigger;
assert(p);
assert(p->state == PATH_DEAD || p->state == PATH_FAILED);
- if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
+
+ trigger = UNIT_TRIGGER(u);
+ if (!trigger || trigger->load_state != UNIT_LOADED) {
+ log_unit_error(u->id, "Refusing to start, unit to trigger not loaded.");
return -ENOENT;
+ }
path_mkdir(p);
diff --git a/src/core/timer.c b/src/core/timer.c
index f318dc6f4..91d8db67e 100644
--- a/src/core/timer.c
+++ b/src/core/timer.c
@@ -343,8 +343,18 @@ static void timer_enter_waiting(Timer *t, bool initial) {
usec_t ts_realtime, ts_monotonic;
usec_t base = 0;
TimerValue *v;
+ Unit *trigger;
int r;
+ assert(t);
+
+ trigger = UNIT_TRIGGER(UNIT(t));
+ if (!trigger) {
+ log_unit_error(UNIT(t)->id, "Unit to trigger vanished.");
+ timer_enter_dead(t, TIMER_FAILURE_RESOURCES);
+ return;
+ }
+
/* If we shall wake the system we use the boottime clock
* rather than the monotonic clock. */
@@ -399,7 +409,7 @@ static void timer_enter_waiting(Timer *t, bool initial) {
case TIMER_UNIT_ACTIVE:
- base = UNIT_TRIGGER(UNIT(t))->inactive_exit_timestamp.monotonic;
+ base = trigger->inactive_exit_timestamp.monotonic;
if (base <= 0)
base = t->last_trigger.monotonic;
@@ -523,6 +533,7 @@ fail:
static void timer_enter_running(Timer *t) {
_cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
+ Unit *trigger;
int r;
assert(t);
@@ -531,8 +542,15 @@ static void timer_enter_running(Timer *t) {
if (unit_stop_pending(UNIT(t)))
return;
- r = manager_add_job(UNIT(t)->manager, JOB_START, UNIT_TRIGGER(UNIT(t)),
- JOB_REPLACE, true, &error, NULL);
+
+ trigger = UNIT_TRIGGER(UNIT(t));
+ if (!trigger) {
+ log_unit_error(UNIT(t)->id, "Unit to trigger vanished.");
+ timer_enter_dead(t, TIMER_FAILURE_RESOURCES);
+ return;
+ }
+
+ r = manager_add_job(UNIT(t)->manager, JOB_START, trigger, JOB_REPLACE, true, &error, NULL);
if (r < 0)
goto fail;
@@ -554,12 +572,16 @@ fail:
static int timer_start(Unit *u) {
Timer *t = TIMER(u);
TimerValue *v;
+ Unit *trigger;
assert(t);
assert(t->state == TIMER_DEAD || t->state == TIMER_FAILED);
- if (UNIT_TRIGGER(u)->load_state != UNIT_LOADED)
+ trigger = UNIT_TRIGGER(u);
+ if (!trigger || trigger->load_state != UNIT_LOADED) {
+ log_unit_error(u->id, "Refusing to start, unit to trigger not loaded.");
return -ENOENT;
+ }
t->last_trigger = DUAL_TIMESTAMP_NULL;