fix(tmq): fix memory leak.

source/dnode/vnode/src/tq/tq.c

@@ -830,7 +830,6 @@ int32_t tqProcessDelCheckInfoReq(STQ* pTq, int64_t sversion, char* msg, int32_t
 int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msgLen) {
   SMqRebVgReq req = {0};
   tDecodeSMqRebVgReq(msg, &req);
-  // todo lock
 
   tqDebug("vgId:%d, tq process sub req %s, Id:0x%" PRIx64 " -> Id:0x%" PRIx64, pTq->pVnode->config.vgId, req.subKey,
           req.oldConsumerId, req.newConsumerId);
@@ -863,8 +862,10 @@ int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msg
     // TODO version should be assigned and refed during preprocess
     SWalRef* pRef = walRefCommittedVer(pTq->pVnode->pWal);
     if (pRef == NULL) {
+      taosMemoryFree(req.qmsg);
       return -1;
     }
+
     int64_t ver = pRef->refVer;
     pHandle->pRef = pRef;
 
@@ -921,6 +922,7 @@ int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msg
     tqDebug("try to persist handle %s consumer:0x%" PRIx64 " , old consumer:0x%" PRIx64, req.subKey,
             pHandle->consumerId, oldConsumerId);
     if (tqMetaSaveHandle(pTq, req.subKey, pHandle) < 0) {
+      taosMemoryFree(req.qmsg);
       return -1;
     }
   } else {
@@ -928,6 +930,7 @@ int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msg
       tqInfo("vgId:%d consumer:0x%" PRIx64 " remains, no switch occurs", req.vgId, req.newConsumerId);
       atomic_store_32(&pHandle->epoch, -1);
       atomic_add_fetch_32(&pHandle->epoch, 1);
+      taosMemoryFree(req.qmsg);
       return tqMetaSaveHandle(pTq, req.subKey, pHandle);
     }
 
@@ -950,10 +953,12 @@ int32_t tqProcessSubscribeReq(STQ* pTq, int64_t sversion, char* msg, int32_t msg
 
     taosWUnLockLatch(&pTq->pushLock);
     if (tqMetaSaveHandle(pTq, req.subKey, pHandle) < 0) {
+      taosMemoryFree(req.qmsg);
       return -1;
     }
   }
 
+  taosMemoryFree(req.qmsg);
   return 0;
 }