Add bounds checking on virConnectListAllStoragePools RPC call

The return values for the virConnectListAllStoragePools call were not
bounds checked. This is a robustness issue for clients if
something where to cause corruption of the RPC stream data.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

daemon/remote.c

@@ -4073,6 +4073,13 @@ remoteDispatchConnectListAllStoragePools(virNetServerPtr server ATTRIBUTE_UNUSED
                                                 args->flags)) < 0)
         goto cleanup;
 
+    if (npools > REMOTE_STORAGE_POOL_LIST_MAX) {
+        virReportError(VIR_ERR_RPC,
+                       _("Too many storage pools '%d' for limit '%d'"),
+                       npools, REMOTE_STORAGE_POOL_LIST_MAX);
+        goto cleanup;
+    }
+
     if (pools && npools) {
         if (VIR_ALLOC_N(ret->pools.pools_val, npools) < 0)
             goto cleanup;

src/remote/remote_driver.c

@@ -3276,6 +3276,13 @@ remoteConnectListAllStoragePools(virConnectPtr conn,
              (char *) &ret) == -1)
         goto done;
 
+    if (ret.pools.pools_len > REMOTE_STORAGE_POOL_LIST_MAX) {
+        virReportError(VIR_ERR_RPC,
+                       _("Too many storage pools '%d' for limit '%d'"),
+                       ret.pools.pools_len, REMOTE_STORAGE_POOL_LIST_MAX);
+        goto cleanup;
+    }
+
     if (pools) {
         if (VIR_ALLOC_N(tmp_pools, ret.pools.pools_len + 1) < 0)
             goto cleanup;

src/remote/remote_protocol.x

@@ -97,8 +97,8 @@ const REMOTE_INTERFACE_NAME_LIST_MAX = 16384;
 /* Upper limit on lists of defined interface names. */
 const REMOTE_DEFINED_INTERFACE_NAME_LIST_MAX = 16384;
 
-/* Upper limit on lists of storage pool names. */
-const REMOTE_STORAGE_POOL_NAME_LIST_MAX = 4096;
+/* Upper limit on lists of storage pools. */
+const REMOTE_STORAGE_POOL_LIST_MAX = 4096;
 
 /* Upper limit on lists of storage vol names. */
 const REMOTE_STORAGE_VOL_NAME_LIST_MAX = 16384;
@@ -1604,7 +1604,7 @@ struct remote_connect_list_storage_pools_args {
 };
 
 struct remote_connect_list_storage_pools_ret {
-    remote_nonnull_string names<REMOTE_STORAGE_POOL_NAME_LIST_MAX>; /* insert@1 */
+    remote_nonnull_string names<REMOTE_STORAGE_POOL_LIST_MAX>; /* insert@1 */
 };
 
 struct remote_connect_num_of_defined_storage_pools_ret {
@@ -1616,7 +1616,7 @@ struct remote_connect_list_defined_storage_pools_args {
 };
 
 struct remote_connect_list_defined_storage_pools_ret {
-    remote_nonnull_string names<REMOTE_STORAGE_POOL_NAME_LIST_MAX>; /* insert@1 */
+    remote_nonnull_string names<REMOTE_STORAGE_POOL_LIST_MAX>; /* insert@1 */
 };
 
 struct remote_connect_find_storage_pool_sources_args {
@@ -2670,7 +2670,7 @@ struct remote_connect_list_all_storage_pools_args {
 };
 
 struct remote_connect_list_all_storage_pools_ret {
-    remote_nonnull_storage_pool pools<>;
+    remote_nonnull_storage_pool pools<REMOTE_STORAGE_POOL_LIST_MAX>;
     unsigned int ret;
 };