[PATCH v2] rpc: fix memory leak in virNetServerClientNew and virNetServerProgramDispatchCall

[Jiang Jiacheng <jiangjiacheng@xxxxxxxxxx>]

From: jiangjiacheng <jiangjiacheng@xxxxxxxxxx>

In virNetServerProgramDispatchCall, The arg is passed as a void* and used to point
to a certain struct depended on the dispatcher, so I think it's the memory of the
struct's member that leaks and this memory shuld be freed by xdr_free.

In virNetServerClientNew, client->rx is assigned by invoking virNetServerClientNew,
but isn't freed if client->privateData's initialization failed, which leads to a
memory leak. Thanks to Liang Peng's suggestion, put virNetMessageFree(client->rx)
into virNetServerClientDispose() to release the memory.

Signed-off-by: jiangjiacheng <jiangjiacheng@xxxxxxxxxx>
---
 src/rpc/virnetserverclient.c  |  2 ++
 src/rpc/virnetserverprogram.c | 12 +++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/src/rpc/virnetserverclient.c b/src/rpc/virnetserverclient.c
index a7d2dfa795..30f6af7be5 100644
--- a/src/rpc/virnetserverclient.c
+++ b/src/rpc/virnetserverclient.c
@@ -931,6 +931,8 @@ void virNetServerClientDispose(void *obj)
     PROBE(RPC_SERVER_CLIENT_DISPOSE,
           "client=%p", client);
 
+    if (client->rx)
+        virNetMessageFree(client->rx);
     if (client->privateData)
         client->privateDataFreeFunc(client->privateData);
 
diff --git a/src/rpc/virnetserverprogram.c b/src/rpc/virnetserverprogram.c
index 3ddf9f0428..a813e821a3 100644
--- a/src/rpc/virnetserverprogram.c
+++ b/src/rpc/virnetserverprogram.c
@@ -409,11 +409,15 @@ virNetServerProgramDispatchCall(virNetServerProgram *prog,
     if (virNetMessageDecodePayload(msg, dispatcher->arg_filter, arg) < 0)
         goto error;
 
-    if (!(identity = virNetServerClientGetIdentity(client)))
+    if (!(identity = virNetServerClientGetIdentity(client))) {
+        xdr_free(dispatcher->arg_filter, arg);
         goto error;
+    }
 
-    if (virIdentitySetCurrent(identity) < 0)
+    if (virIdentitySetCurrent(identity) < 0) {
+        xdr_free(dispatcher->arg_filter, arg);
         goto error;
+    }
 
     /*
      * When the RPC handler is called:
@@ -427,8 +431,10 @@ virNetServerProgramDispatchCall(virNetServerProgram *prog,
      */
     rv = (dispatcher->func)(server, client, msg, &rerr, arg, ret);
 
-    if (virIdentitySetCurrent(NULL) < 0)
+    if (virIdentitySetCurrent(NULL) < 0) {
+        xdr_free(dispatcher->arg_filter, arg);
         goto error;
+    }
 
     /*
      * If rv == 1, this indicates the dispatch func has
-- 
2.27.0