[libvirt] [PATCH] qemu: Fix potential crash when attaching/detaching cdrom or floppy

[Osier Yang]

The crash could happen if the disk source is empty for cdrom or
floppy disk.
---
 src/qemu/qemu_driver.c  |    7 +++++--
 src/qemu/qemu_process.c |    3 +++
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 812bf95..906501b 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -5884,7 +5884,9 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
     }
 
     if (ret == 0) {
-        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)
                 VIR_WARN("Failed to add disk '%s' to shared disk table",
                          disk->src);
@@ -6011,7 +6013,8 @@ qemuDomainDetachDeviceDiskLive(virQEMUDriverPtr driver,
 
     if (ret == 0 &&
         disk->type == VIR_DOMAIN_DISK_TYPE_BLOCK &&
-        disk->shared) {
+        disk->shared &&
+        disk->src) {
         if (qemuRemoveSharedDisk(driver->sharedDisks, disk->src) < 0)
              VIR_WARN("Failed to remove disk '%s' from shared disk table",
                       disk->src);
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index d1872c0..98ed552 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3458,6 +3458,9 @@ qemuCheckSharedDisk(virHashTablePtr sharedDisks,
     char *key = NULL;
     int ret = 0;
 
+    if (!disk->src)
+        return 0;
+
     if (!(key = qemuGetSharedDiskKey(disk->src)))
         return -1;
 
-- 
1.7.7.6