From 248448bd6f47d120677ed5e0f562db656ff07f17 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.
---
 src/libelogind/sd-bus/sd-bus.c | 45 +++++++++++++++++++++-------------
 1 file changed, 28 insertions(+), 17 deletions(-)

diff --git a/src/libelogind/sd-bus/sd-bus.c b/src/libelogind/sd-bus/sd-bus.c
index 8a465b9da..c71b0fa22 100644
--- a/src/libelogind/sd-bus/sd-bus.c
+++ b/src/libelogind/sd-bus/sd-bus.c
@@ -2984,8 +2984,10 @@ 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;
 }
@@ -2997,8 +2999,10 @@ 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;
 }
@@ -3012,38 +3016,45 @@ 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;
 }
-- 
2.30.2