ipc: apr: check for packet size to header size comparison

Check if packet size is large enough to hold the header.

Change-Id: I7261f8111d8b5f4f7c181e469de248a732242d64
Signed-off-by: Karthikeyan Mani <[email protected]>

ipc/apr.c

@@ -636,6 +636,12 @@ void apr_cb_func(void *buf, int len, void *priv)
 		pr_err("APR: Wrong paket size\n");
 		return;
 	}
+
+	if (hdr->pkt_size < hdr_size) {
+		pr_err("APR: Packet size less than header size\n");
+		return;
+	}
+
 	msg_type = hdr->hdr_field;
 	msg_type = (msg_type >> 0x08) & 0x0003;
 	if (msg_type >= APR_MSG_TYPE_MAX && msg_type != APR_BASIC_RSP_RESULT) {