[PATCH] qemu: Fix crash when using shared cdrom or floppy disk without source

[Osier Yang <jyang@xxxxxxxxxx>]

How to reproduce the crash:

  * Start a guest with a disk like:

    <disk type='block' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <target dev='hdc' bus='ide'/>
      <readonly/>
      <shareable/>
      <address type='drive' controller='0' bus='1' target='0' unit='0'/>
    </disk>

It's caused by disk->src for this disk is NULL. This patch fixes it.
---
 src/qemu/qemu_process.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index a2ce007..d1872c0 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3837,7 +3837,9 @@ int qemuProcessStart(virConnectPtr conn,
                            _("Raw I/O is not supported on this platform"));
 #endif
 
-        if (disk->type == VIR_DOMAIN_DISK_TYPE_BLOCK && disk->shared) {
+        if (disk->type == VIR_DOMAIN_DISK_TYPE_BLOCK &&
+            disk->shared &&
+            disk->src) {
             if (qemuAddSharedDisk(driver->sharedDisks, disk->src) < 0)
                 goto cleanup;
 
@@ -4246,7 +4248,9 @@ void qemuProcessStop(virQEMUDriverPtr driver,
     for (i = 0; i < vm->def->ndisks; i++) {
         virDomainDiskDefPtr disk = vm->def->disks[i];
 
-        if (disk->type == VIR_DOMAIN_DISK_TYPE_BLOCK && disk->shared) {
+        if (disk->type == VIR_DOMAIN_DISK_TYPE_BLOCK &&
+            disk->shared &&
+            disk->src) {
             ignore_value(qemuRemoveSharedDisk(driver->sharedDisks, disk->src));
         }
     }
-- 
1.7.7.6

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