[libvirt] [PATCH] qemu: Fix starting of VMs with empty CDROM drives

[Peter Krempa]

Since 24e5cafba6dbc2722e05f92dc0ae31b0f938f9f0 (thankfully unreleased)
when a VM with an empty disk drive would be started the code would call
stat() on NULL path as a check was missing from the callback rendering
machines unstartable.

Report success when the path is empty (denoting an empty drive).
---
 src/qemu/qemu_driver.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index ca0d77f..704ba39 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -343,6 +343,9 @@ qemuSecurityChownCallback(virStorageSourcePtr src,
     if (virStorageSourceIsLocalStorage(src)) {
         /* use direct chmod for local files so that the file doesn't
          * need to be initialized */
+        if (!src->path)
+            return 0;
+
         if (stat(src->path, &sb) >= 0) {
             if (sb.st_uid == uid &&
                 sb.st_gid == gid) {
-- 
2.0.0