Fix potential crash in classtype parsing code

src/stream-tcp-reassemble.c

@@ -561,6 +561,10 @@ int StreamTcpReassembleInsertSegment(ThreadVars *tv, TcpReassemblyThreadCtx *ra_
             "ra_app_base_seq %"PRIu32, TCP_GET_SEQ(p), (TCP_GET_SEQ(p)+p->payload_len),
             stream->last_ack, stream->ra_app_base_seq);
 
+    if (seg == NULL) {
+        goto end;
+    }
+
     /* fast track */
     if (list_seg == NULL) {
         SCLogDebug("empty list, inserting seg %p seq %" PRIu32 ", "

src/util-classification-config.c

@@ -236,6 +236,9 @@ int SCClassConfAddClasstype(char *rawstr, uint8_t index, DetectEngineCtx *de_ctx
         SCLogInfo("pcre_get_substring() failed");
         goto error;
     }
+    if (ct_priority_str == NULL) {
+        goto error;
+    }
 
     ct_priority = atoi(ct_priority_str);