integ/base/systemd/centos/patches/914-sd-event-update-state-at-the-end-in-event_source_ena.patch

From ad89da1e00919c510596dac78741c98052b1e2f7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Tue, 10 Nov 2020 10:38:37 +0100
Subject: [PATCH 14/20] sd-event: update state at the end in
 event_source_enable

Coverity in CID#1435966 was complaining that s->enabled is not "restored" in
all cases. But the code was actually correct, since it should only be
"restored" in the error paths. But let's still make this prettier by not setting
the state before all operations that may fail are done.

We need to set .enabled for the prioq reshuffling operations, so move those down.

No functional change intended.

(cherry picked from commit d2eafe61ca07f8300dc741a0491a914213fa2b6b)

Related: #1819868

[commit deb9e6ad3a1d7cfbc3b53d1e74cda6ae398a90fd from
https://github.com/systemd-rhel/rhel-8/]

Signed-off-by: Li Zhou <li.zhou@windriver.com>
---
 src/libsystemd/sd-event/sd-event.c | 51 +++++++++++++++++-------------
 1 file changed, 29 insertions(+), 22 deletions(-)

diff --git a/src/libsystemd/sd-event/sd-event.c b/src/libsystemd/sd-event/sd-event.c
index 82cb9ad..3ff15a2 100644
--- a/src/libsystemd/sd-event/sd-event.c
+++ b/src/libsystemd/sd-event/sd-event.c
@@ -1691,11 +1691,11 @@ static int event_source_disable(sd_event_source *s) {
         return 0;
 }
 
-static int event_source_enable(sd_event_source *s, int m) {
+static int event_source_enable(sd_event_source *s, int enable) {
         int r;
 
         assert(s);
-        assert(IN_SET(m, SD_EVENT_ON, SD_EVENT_ONESHOT));
+        assert(IN_SET(enable, SD_EVENT_ON, SD_EVENT_ONESHOT));
         assert(s->enabled == SD_EVENT_OFF);
 
         /* Unset the pending flag when this event source is enabled */
@@ -1705,31 +1705,16 @@ static int event_source_enable(sd_event_source *s, int m) {
                         return r;
         }
 
-        s->enabled = m;
-
         switch (s->type) {
-
         case SOURCE_IO:
-                r = source_io_register(s, m, s->io.events);
-                if (r < 0) {
-                        s->enabled = SD_EVENT_OFF;
+                r = source_io_register(s, enable, s->io.events);
+                if (r < 0)
                         return r;
-                }
-
-                break;
-
-        case SOURCE_TIME_REALTIME:
-        case SOURCE_TIME_BOOTTIME:
-        case SOURCE_TIME_MONOTONIC:
-        case SOURCE_TIME_REALTIME_ALARM:
-        case SOURCE_TIME_BOOTTIME_ALARM:
-                event_source_time_prioq_reshuffle(s);
                 break;
 
         case SOURCE_SIGNAL:
                 r = event_make_signal_data(s->event, s->signal.sig, NULL);
                 if (r < 0) {
-                        s->enabled = SD_EVENT_OFF;
                         event_gc_signal_data(s->event, &s->priority, s->signal.sig);
                         return r;
                 }
@@ -1750,10 +1735,12 @@ static int event_source_enable(sd_event_source *s, int m) {
 
                 break;
 
+        case SOURCE_TIME_REALTIME:
+        case SOURCE_TIME_BOOTTIME:
+        case SOURCE_TIME_MONOTONIC:
+        case SOURCE_TIME_REALTIME_ALARM:
+        case SOURCE_TIME_BOOTTIME_ALARM:
         case SOURCE_EXIT:
-                prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index);
-                break;
-
         case SOURCE_DEFER:
         case SOURCE_POST:
                 break;
@@ -1762,6 +1749,26 @@ static int event_source_enable(sd_event_source *s, int m) {
                 assert_not_reached("Wut? I shouldn't exist.");
         }
 
+        s->enabled = enable;
+
+        /* Non-failing operations below */
+        switch (s->type) {
+        case SOURCE_TIME_REALTIME:
+        case SOURCE_TIME_BOOTTIME:
+        case SOURCE_TIME_MONOTONIC:
+        case SOURCE_TIME_REALTIME_ALARM:
+        case SOURCE_TIME_BOOTTIME_ALARM:
+                event_source_time_prioq_reshuffle(s);
+                break;
+
+        case SOURCE_EXIT:
+                prioq_reshuffle(s->event->exit, s, &s->exit.prioq_index);
+                break;
+
+        default:
+                break;
+        }
+
         return 0;
 }
 
-- 
2.17.1