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.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
@@ -102,6 +102,7 @@ struct pktlog_dev_t {
 	void *htc_pdev;
 	bool vendor_cmd_send;
 	uint8_t callback_type;
+	uint32_t invalid_packets;
 };
 
 #define PKTLOG_SYSCTL_SIZE      14

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;

utils/pktlog/pktlog_internal.c

@@ -685,6 +685,11 @@ process_offload_pktlog(struct cdp_pdev *pdev, void *data)
 	pl_hdr.type_specific_data = *(pl_tgt_hdr
 			+ ATH_PKTLOG_HDR_TYPE_SPECIFIC_DATA_OFFSET);
 
+	if (pl_hdr.size > MAX_PKTLOG_RECV_BUF_SIZE) {
+		pl_dev->invalid_packets++;
+		return A_ERROR;
+	}
+
 	/*
 	 *  Must include to process different types
 	 *  TX_CTL, TX_STATUS, TX_MSDU_ID, TX_FRM_HDR