static int decode_encrypt_ctx(struct TCP_Server_Info *server,
			      struct smb2_encryption_neg_context *ctxt)
{
	unsigned int len = le16_to_cpu(ctxt->DataLength);

	cifs_dbg(FYI, "decode SMB3.11 encryption neg context of len %d\n", len);
	if (len < MIN_ENCRYPT_CTXT_DATA_LEN) {
		printk_once(KERN_WARNING "server sent bad crypto ctxt len\n");
		return -EINVAL;
	}

	if (le16_to_cpu(ctxt->CipherCount) != 1) {
		printk_once(KERN_WARNING "illegal SMB3.11 cipher count\n");
		return -EINVAL;
	}
	cifs_dbg(FYI, "SMB311 cipher type:%d\n", le16_to_cpu(ctxt->Ciphers[0]));
	if ((ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_CCM) &&
	    (ctxt->Ciphers[0] != SMB2_ENCRYPTION_AES128_GCM)) {
		printk_once(KERN_WARNING "invalid SMB3.11 cipher returned\n");
		return -EINVAL;
	}
	server->cipher_type = ctxt->Ciphers[0];
	server->capabilities |= SMB2_GLOBAL_CAP_ENCRYPTION;
	return 0;
}

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory belongs to the code that operates on the new pointer.