[libvirt] [PATCH] Fix error return value for VirCommandNewArgList

[harryxiyou at gmail.com]

From: Harry Wei <harryxiyou at gmail.com>

virCommandNewArgList may return NULL so we need not
do following stuffs and just return '-1'.

Signed-off-by: Harry Wei <harryxiyou at gmail.com>
CC: Osier Yang <jyang at redhat.com>
CC: Michal Privoznik <mprivozn at redhat.com>
---
 src/storage/storage_backend_sheepdog.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/storage/storage_backend_sheepdog.c b/src/storage/storage_backend_sheepdog.c
index 35a3a04..3452eaa 100644
--- a/src/storage/storage_backend_sheepdog.c
+++ b/src/storage/storage_backend_sheepdog.c
@@ -120,6 +120,8 @@ virStorageBackendSheepdogRefreshPool(virConnectPtr conn ATTRIBUTE_UNUSED,
     virCommandPtr cmd;
 
     cmd = virCommandNewArgList(COLLIE, "node", "info", "-r", NULL);
+    if (cmd == NULL)
+        return -1;
     virStorageBackendSheepdogAddHostArg(cmd, pool);
     virCommandSetOutputBuffer(cmd, &output);
     ret = virCommandRun(cmd, NULL);
@@ -142,6 +144,8 @@ virStorageBackendSheepdogDeleteVol(virConnectPtr conn ATTRIBUTE_UNUSED,
     virCheckFlags(0, -1);
 
     virCommandPtr cmd = virCommandNewArgList(COLLIE, "vdi", "delete", vol->name, NULL);
+    if (cmd == NULL)
+        return -1;
     virStorageBackendSheepdogAddHostArg(cmd, pool);
     int ret = virCommandRun(cmd, NULL);
 
@@ -165,6 +169,8 @@ virStorageBackendSheepdogCreateVol(virConnectPtr conn ATTRIBUTE_UNUSED,
     }
 
     virCommandPtr cmd = virCommandNewArgList(COLLIE, "vdi", "create", vol->name, NULL);
+    if (cmd == NULL)
+        return -1;
     virCommandAddArgFormat(cmd, "%llu", vol->capacity);
     virStorageBackendSheepdogAddHostArg(cmd, pool);
     if (virCommandRun(cmd, NULL) < 0)
@@ -251,6 +257,8 @@ virStorageBackendSheepdogRefreshVol(virConnectPtr conn ATTRIBUTE_UNUSED,
     char *output = NULL;
 
     virCommandPtr cmd = virCommandNewArgList(COLLIE, "vdi", "list", vol->name, "-r", NULL);
+    if (cmd == NULL)
+        return -1;
     virStorageBackendSheepdogAddHostArg(cmd, pool);
     virCommandSetOutputBuffer(cmd, &output);
     ret = virCommandRun(cmd, NULL);
@@ -293,6 +301,8 @@ virStorageBackendSheepdogResizeVol(virConnectPtr conn ATTRIBUTE_UNUSED,
     virCheckFlags(0, -1);
 
     virCommandPtr cmd = virCommandNewArgList(COLLIE, "vdi", "resize", vol->name, NULL);
+    if (cmd == NULL)
+        return -1;
     virCommandAddArgFormat(cmd, "%llu", capacity);
     virStorageBackendSheepdogAddHostArg(cmd, pool);
     int ret = virCommandRun(cmd, NULL);
-- 
1.7.9.5