qcacmn: Add a check to avoid processing invalid pktlog buffers

Avoid further processing of pktlog buffers received from
firmware or Hardware if the size is greater than
MAX_PKTLOG_RECV_BUF_SIZE.

Change-Id: If1dd855137a9b83721f01005fa3367f7924f4ebb
CRs-Fixed: 2493721

utils/pktlog/include/pktlog_ac_i.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2012-2018 The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2019 The Linux Foundation. All rights reserved.
  *
  * Permission to use, copy, modify, and/or distribute this software for
  * any purpose with or without fee is hereby granted, provided that the
@@ -33,6 +33,9 @@
 #define PKTLOG_DEFAULT_PHYERR_THRESH    300
 #define PKTLOG_DEFAULT_TRIGGER_INTERVAL 500
 
+/* Max Pktlog buffer size received from fw/hw */
+#define MAX_PKTLOG_RECV_BUF_SIZE        2048
+
 struct ath_pktlog_arg {
 	struct ath_pktlog_info *pl_info;
 	uint32_t flags;