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862298a2e7
Apparently we are not the only ones with dumb free functions because dbus_message_unref() does not accept NULL either. But if I were to vote, this one is even more evil. Instead of returning an error just like we do it immediately dereference any pointer passed and thus crash you app. Well done DBus! Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7f878ebda700 (LWP 31264)] 0x00007f87be4016e5 in ?? () from /usr/lib64/libdbus-1.so.3 (gdb) bt #0 0x00007f87be4016e5 in ?? () from /usr/lib64/libdbus-1.so.3 #1 0x00007f87be3f004e in dbus_message_unref () from /usr/lib64/libdbus-1.so.3 #2 0x00007f87bf6ecf95 in virSystemdGetMachineNameByPID (pid=9849) at util/virsystemd.c:228 #3 0x00007f879761bd4d in qemuConnectCgroup (driver=0x7f87600a32a0, vm=0x7f87600c7550) at qemu/qemu_cgroup.c:909 #4 0x00007f87976386b7 in qemuProcessReconnect (opaque=0x7f87600db840) at qemu/qemu_process.c:3386 #5 0x00007f87bf6edfff in virThreadHelper (data=0x7f87600d5580) at util/virthread.c:206 #6 0x00007f87bb602334 in start_thread (arg=0x7f878ebda700) at pthread_create.c:333 #7 0x00007f87bb3481bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109 (gdb) frame 2 #2 0x00007f87bf6ecf95 in virSystemdGetMachineNameByPID (pid=9849) at util/virsystemd.c:228 228 dbus_message_unref(reply); (gdb) p reply $1 = (DBusMessage *) 0x0 Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>