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/********************************************************************************/
/* */
/* TPM Memory Allocation */
/* Written by Ken Goldman */
/* IBM Thomas J. Watson Research Center */
/* $Id: tpm_memory.c 4609 2011-08-26 19:27:38Z kgoldman $ */
/* */
/* (c) Copyright IBM Corporation 2006, 2010. */
/* */
/* All rights reserved. */
/* */
/* Redistribution and use in source and binary forms, with or without */
/* modification, are permitted provided that the following conditions are */
/* met: */
/* */
/* Redistributions of source code must retain the above copyright notice, */
/* this list of conditions and the following disclaimer. */
/* */
/* Redistributions in binary form must reproduce the above copyright */
/* notice, this list of conditions and the following disclaimer in the */
/* documentation and/or other materials provided with the distribution. */
/* */
/* Neither the names of the IBM Corporation nor the names of its */
/* contributors may be used to endorse or promote products derived from */
/* this software without specific prior written permission. */
/* */
/* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS */
/* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT */
/* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR */
/* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT */
/* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, */
/* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT */
/* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, */
/* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY */
/* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT */
/* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE */
/* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
/********************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "tpm_debug.h"
#include "tpm_error.h"
#include "tpm_memory.h"
/* TPM_Malloc() is a general purpose wrapper around malloc()
*/
TPM_RESULT TPM_Malloc(unsigned char **buffer, uint32_t size)
{
TPM_RESULT rc = 0;
/* assertion test. The coding style requires that all allocated pointers are initialized to
NULL. A non-NULL value indicates either a missing initialization or a pointer reuse (a
memory leak). */
if (rc == 0) {
if (*buffer != NULL) {
printf("TPM_Malloc: Error (fatal), *buffer %p should be NULL before malloc\n", *buffer);
rc = TPM_FAIL;
}
}
/* verify that the size is not "too large" */
if (rc == 0) {
if (size > TPM_ALLOC_MAX) {
printf("TPM_Malloc: Error, size %u greater than maximum allowed\n", size);
rc = TPM_SIZE;
}
}
/* verify that the size is not 0, this would be implementation defined and should never occur */
if (rc == 0) {
if (size == 0) {
printf("TPM_Malloc: Error (fatal), size is zero\n");
rc = TPM_FAIL;
}
}
if (rc == 0) {
*buffer = malloc(size);
if (*buffer == NULL) {
printf("TPM_Malloc: Error allocating %u bytes\n", size);
rc = TPM_SIZE;
}
}
return rc;
}
/* TPM_Realloc() is a general purpose wrapper around realloc()
*/
TPM_RESULT TPM_Realloc(unsigned char **buffer,
uint32_t size)
{
TPM_RESULT rc = 0;
unsigned char *tmpptr = NULL;
/* verify that the size is not "too large" */
if (rc == 0) {
if (size > TPM_ALLOC_MAX) {
printf("TPM_Realloc: Error, size %u greater than maximum allowed\n", size);
rc = TPM_SIZE;
}
}
if (rc == 0) {
tmpptr = realloc(*buffer, size);
if (tmpptr == NULL) {
printf("TPM_Realloc: Error reallocating %u bytes\n", size);
rc = TPM_SIZE;
}
}
if (rc == 0) {
*buffer = tmpptr;
}
return rc;
}
/* TPM_Free() is the companion to the TPM allocation functions. It is not used internally. The
intent is for use by an application that links directly to a TPM and wants to free memory
allocated by the TPM.
It avoids a potential problem if the application uses a different allocation library, perhaps one
that wraps the functions to detect overflows or memory leaks.
*/
void TPM_Free(unsigned char *buffer)
{
free(buffer);
return;
}
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