qcacld-3.0: Update SSID check while processing assoc req

Currently host uses starting address of below structure
to compare between SSID coming via association request
(here SSID name is "12") and SSID at which SAP is up
(here SAP SSID name is "13").
typedef struct sSirMacSSid {
    uint8_t length;
    uint8_t ssId[WLAN_SSID_MAX_LEN +1];
} qdf_packed tSirMacSSid;

SSID      First Bytes        Second Bytes   Third Bytes
“12”    Length of SSID = 2        1             2
“13”    Length of SSID = 2        1             3

lim_cmp_ssid(), calls qdf_mem_cmp(), to compare 2 bytes
of memory starting from pointer to session_entry->ssId
above structure. In the above case content of the First
bytes and Second bytes are the same, so qdf_mem_cmp()
returns true to caller API even though both SSID is not
exactly the same. This results in even though SAP's SSID
name is "13", the host allows the processing of an
association request from a client with destination SSID
name is "12" and with the same MAC address, which is not
expected.

To exact Comparision between SSID, lim_cmp_ssid() should
call qdf_mem_cmp() with starting address of pointer to SSID
array present in above structure.

Change-Id: I9879fe09d383b04ec8ab5ad738d1d8efa8fb0f7e
CRs-Fixed: 3282602

core/mac/src/pe/lim/lim_assoc_utils.c

@@ -79,7 +79,10 @@
  */
 uint32_t lim_cmp_ssid(tSirMacSSid *rx_ssid, struct pe_session *session_entry)
 {
-	return qdf_mem_cmp(rx_ssid, &session_entry->ssId,
+	if (session_entry->ssId.length != rx_ssid->length)
+		return 1;
+
+	return qdf_mem_cmp(rx_ssid->ssId, &session_entry->ssId.ssId,
 				session_entry->ssId.length);
 }