qcacld-3.0: Prepare non-zero IV for auth seq 3 frames

If the initialization vector is zero, some IOT APs unable to decrypt
auth sequence 3 frame, which leads to disconnection. As IV is first 3
bytes of uninitialized "seed local variable", there are the changes of
having IV value as 0.
Hence host prepares non-zero initialization vector to encrypt auth
sequence 3 frame.

Change-Id: Ifc24ccc6c669bac3fc0389670580f6a9ec2672a0
CRs-Fixed: 2750718

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

@@ -517,6 +517,13 @@ lim_encrypt_auth_frame(struct mac_context *mac, uint8_t keyId, uint8_t *pKey,
 			SIR_MAC_AUTH_FRAME_INFO_LEN + SIR_MAC_CHALLENGE_ID_LEN;
 	keyLength += 3;
 
+	/*
+	 * Make sure that IV is non-zero, because few IOT APs fails to decrypt
+	 * auth sequence 3 encrypted frames if initialization vector value is 0
+	 */
+	while (!(*(uint32_t *)seed))
+		qdf_get_random_bytes(seed, SIR_MAC_WEP_IV_LENGTH);
+
 	/* Bytes 3-7 of seed is key */
 	qdf_mem_copy((uint8_t *) &seed[3], pKey, keyLength - 3);