From 4e78db7126779a9f6432ead9a73cdab1087405bc Mon Sep 17 00:00:00 2001
From: Lukas Nykryn <lnykryn@redhat.com>
Date: Fri, 17 Apr 2015 15:12:00 +0200
Subject: [PATCH] machine: do not rely on asprintf setting arg on error

Strictly speaking, the output variable is undefined if asprintf fails.
We use the return value not the arg everywhere, and should we do here.

(Based on 2c07315225bef6be4830bce25a74da7f0ba4fcdc)
---
 src/machine/machine-dbus.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/machine/machine-dbus.c b/src/machine/machine-dbus.c
index b0f0f66e09..624a99f4e9 100644
--- a/src/machine/machine-dbus.c
+++ b/src/machine/machine-dbus.c
@@ -438,6 +438,7 @@ int bus_machine_method_open_login(sd_bus *bus, sd_bus_message *message, void *us
         _cleanup_close_ int master = -1;
         Machine *m = userdata;
         const char *p;
+        char *address;
         int r;
 
         if (m->class != MACHINE_CONTAINER)
@@ -475,13 +476,14 @@ int bus_machine_method_open_login(sd_bus *bus, sd_bus_message *message, void *us
                 return r;
 
 #ifdef ENABLE_KDBUS
-        asprintf(&container_bus->address, "x-machine-kernel:pid=" PID_FMT ";x-machine-unix:pid=" PID_FMT, m->leader, m->leader);
+#  define ADDRESS_FMT "x-machine-kernel:pid=%1$" PID_PRI ";x-machine-unix:pid=%1$" PID_PRI
 #else
-        asprintf(&container_bus->address, "x-machine-unix:pid=" PID_FMT, m->leader);
+#  define ADDRESS_FMT "x-machine-unix:pid=%1$" PID_PRI
 #endif
-        if (!container_bus->address)
-                return -ENOMEM;
+        if (asprintf(&address, ADDRESS_FMT, m->leader) < 0)
+                return log_oom();
 
+        container_bus->address = address;
         container_bus->bus_client = true;
         container_bus->trusted = false;
         container_bus->is_system = true;