[libvirt] [PATCH 05/24] maint: don't leave garbage on early API exit

[Eric Blake]

Several APIs clear out a user input buffer before attempting to
populate it; but in a few cases we missed this memset if we
detect a reason for an early exit.

* src/libvirt.c (virDomainGetInfo, virDomainGetBlockInfo)
(virStoragePoolGetInfo, virStorageVolGetInfo)
(virDomainGetJobInfo, virDomainGetBlockJobInfo): Move memset
before any returns.

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 src/libvirt.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/src/libvirt.c b/src/libvirt.c
index 33f7078..7fd6072 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -4461,6 +4461,8 @@ virDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)

     virResetLastError();

+    memset(info, 0, sizeof(virDomainInfo));
+
     if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
         virLibDomainError(VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
         virDispatchError(NULL);
@@ -4468,8 +4470,6 @@ virDomainGetInfo(virDomainPtr domain, virDomainInfoPtr info)
     }
     virCheckNonNullArgGoto(info, error);

-    memset(info, 0, sizeof(virDomainInfo));
-
     conn = domain->conn;

     if (conn->driver->domainGetInfo) {
@@ -9114,6 +9114,8 @@ virDomainGetBlockInfo(virDomainPtr domain, const char *disk,

     virResetLastError();

+    memset(info, 0, sizeof(virDomainBlockInfo));
+
     if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
         virLibDomainError(VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
         virDispatchError(NULL);
@@ -9122,8 +9124,6 @@ virDomainGetBlockInfo(virDomainPtr domain, const char *disk,
     virCheckNonNullArgGoto(disk, error);
     virCheckNonNullArgGoto(info, error);

-    memset(info, 0, sizeof(virDomainBlockInfo));
-
     conn = domain->conn;

     if (conn->driver->domainGetBlockInfo) {
@@ -14297,6 +14297,8 @@ virStoragePoolGetInfo(virStoragePoolPtr pool,

     virResetLastError();

+    memset(info, 0, sizeof(virStoragePoolInfo));
+
     if (!VIR_IS_CONNECTED_STORAGE_POOL(pool)) {
         virLibStoragePoolError(VIR_ERR_INVALID_STORAGE_POOL, __FUNCTION__);
         virDispatchError(NULL);
@@ -14304,8 +14306,6 @@ virStoragePoolGetInfo(virStoragePoolPtr pool,
     }
     virCheckNonNullArgGoto(info, error);

-    memset(info, 0, sizeof(virStoragePoolInfo));
-
     conn = pool->conn;

     if (conn->storageDriver->storagePoolGetInfo) {
@@ -15281,6 +15281,8 @@ virStorageVolGetInfo(virStorageVolPtr vol,

     virResetLastError();

+    memset(info, 0, sizeof(virStorageVolInfo));
+
     if (!VIR_IS_CONNECTED_STORAGE_VOL(vol)) {
         virLibStorageVolError(VIR_ERR_INVALID_STORAGE_VOL, __FUNCTION__);
         virDispatchError(NULL);
@@ -15288,8 +15290,6 @@ virStorageVolGetInfo(virStorageVolPtr vol,
     }
     virCheckNonNullArgGoto(info, error);

-    memset(info, 0, sizeof(virStorageVolInfo));
-
     conn = vol->conn;

     if (conn->storageDriver->storageVolGetInfo){
@@ -18918,6 +18918,8 @@ virDomainGetJobInfo(virDomainPtr domain, virDomainJobInfoPtr info)

     virResetLastError();

+    memset(info, 0, sizeof(virDomainJobInfo));
+
     if (!VIR_IS_CONNECTED_DOMAIN(domain)) {
         virLibDomainError(VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
         virDispatchError(NULL);
@@ -18925,8 +18927,6 @@ virDomainGetJobInfo(virDomainPtr domain, virDomainJobInfoPtr info)
     }
     virCheckNonNullArgGoto(info, error);

-    memset(info, 0, sizeof(virDomainJobInfo));
-
     conn = domain->conn;

     if (conn->driver->domainGetJobInfo) {
@@ -21245,6 +21245,8 @@ virDomainGetBlockJobInfo(virDomainPtr dom, const char *disk,

     virResetLastError();

+    memset(info, 0, sizeof(*info));
+
     if (!VIR_IS_CONNECTED_DOMAIN(dom)) {
         virLibDomainError(VIR_ERR_INVALID_DOMAIN, __FUNCTION__);
         virDispatchError(NULL);
@@ -21255,8 +21257,6 @@ virDomainGetBlockJobInfo(virDomainPtr dom, const char *disk,
     virCheckNonNullArgGoto(disk, error);
     virCheckNonNullArgGoto(info, error);

-    memset(info, 0, sizeof(*info));
-
     if (conn->driver->domainGetBlockJobInfo) {
         int ret;
         ret = conn->driver->domainGetBlockJobInfo(dom, disk, info, flags);
-- 
1.8.4.2