From e525ce5713f8263258c2cdf687adc67108425f6a Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 15 Dec 2017 22:24:16 +0100
Subject: [PATCH] sd-bus: when attached to an sd-event loop, disconnect on
 processing errors

If we can't process the bus for some reason we shouldn't just disable
the event source, but log something and give up on the connection. Hence
do that, and disconnect.

(cherry-picked from commit 5ae37ad833583e6c1c7765767b7f8360afca3b07)

Resolves: #1817504
---
 src/libsystemd/sd-bus/sd-bus.c | 45 +++++++++++++++++++++-------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/src/libsystemd/sd-bus/sd-bus.c b/src/libsystemd/sd-bus/sd-bus.c
index 44ed2c7497..2c8cc66367 100644
--- a/src/libsystemd/sd-bus/sd-bus.c
+++ b/src/libsystemd/sd-bus/sd-bus.c
@@ -3037,8 +3037,10 @@ static int io_callback(sd_event_source *s, int fd, uint32_t revents, void *userd
         assert(bus);
 
         r = sd_bus_process(bus, NULL);
-        if (r < 0)
-                return r;
+        if (r < 0) {
+                log_debug_errno(r, "Processing of bus failed, closing down: %m");
+                bus_enter_closing(bus);
+        }
 
         return 1;
 }
@@ -3050,8 +3052,10 @@ static int time_callback(sd_event_source *s, uint64_t usec, void *userdata) {
         assert(bus);
 
         r = sd_bus_process(bus, NULL);
-        if (r < 0)
-                return r;
+        if (r < 0) {
+                log_debug_errno(r, "Processing of bus failed, closing down: %m");
+                bus_enter_closing(bus);
+        }
 
         return 1;
 }
@@ -3065,38 +3069,45 @@ static int prepare_callback(sd_event_source *s, void *userdata) {
         assert(bus);
 
         e = sd_bus_get_events(bus);
-        if (e < 0)
-                return e;
+        if (e < 0) {
+                r = e;
+                goto fail;
+        }
 
         if (bus->output_fd != bus->input_fd) {
 
                 r = sd_event_source_set_io_events(bus->input_io_event_source, e & POLLIN);
                 if (r < 0)
-                        return r;
+                        goto fail;
 
                 r = sd_event_source_set_io_events(bus->output_io_event_source, e & POLLOUT);
-                if (r < 0)
-                        return r;
-        } else {
+        } else
                 r = sd_event_source_set_io_events(bus->input_io_event_source, e);
-                if (r < 0)
-                        return r;
-        }
+        if (r < 0)
+                goto fail;
 
         r = sd_bus_get_timeout(bus, &until);
         if (r < 0)
-                return r;
+                goto fail;
         if (r > 0) {
                 int j;
 
                 j = sd_event_source_set_time(bus->time_event_source, until);
-                if (j < 0)
-                        return j;
+                if (j < 0) {
+                        r = j;
+                        goto fail;
+                }
         }
 
         r = sd_event_source_set_enabled(bus->time_event_source, r > 0);
         if (r < 0)
-                return r;
+                goto fail;
+
+        return 1;
+
+fail:
+        log_debug_errno(r, "Preparing of bus events failed, closing down: %m");
+        bus_enter_closing(bus);
 
         return 1;
 }