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// SPDX-License-Identifier: GPL-2.0-or-later
/* SPDX-FileCopyrightText: 2006-2015 Marek Lindner <mareklindner@neomailbox.ch>
* SPDX-FileCopyrightText: 2006-2015 Simon Wunderlich <sw@simonwunderlich.de>
*/
/* this file is taken from the batman project (www.open-mesh.net/batman)
* to find heap corruptions... */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "allocate.h"
#define DEBUG_MALLOC
#define MAGIC_NUMBER 0x12345678
#if defined DEBUG_MALLOC
static struct chunkHeader *chunkList = NULL;
struct chunkHeader {
struct chunkHeader *next;
unsigned int length;
int tag;
unsigned int magicNumber;
};
struct chunkTrailer {
unsigned int magicNumber;
};
void checkIntegrity(void)
{
struct chunkHeader *walker;
struct chunkTrailer *chunkTrailer;
unsigned char *memory;
for (walker = chunkList; walker != NULL; walker = walker->next) {
if (walker->magicNumber != MAGIC_NUMBER) {
fprintf(stderr, "Invalid magic number in header: %08x, tag = %d\n", walker->magicNumber, walker->tag);
exit(1);
}
memory = (unsigned char *)walker;
chunkTrailer = (struct chunkTrailer *)(memory + sizeof(struct chunkHeader) + walker->length);
if (chunkTrailer->magicNumber != MAGIC_NUMBER) {
fprintf(stderr, "Invalid magic number in header: %08x, tag = %d\n", chunkTrailer->magicNumber, walker->tag);
exit(1);
}
}
}
void checkLeak(void)
{
struct chunkHeader *walker;
for (walker = chunkList; walker != NULL; walker = walker->next)
fprintf(stderr, "Memory leak detected, tag = %d\n", walker->tag);
}
void *debugMalloc(unsigned int length, int tag)
{
unsigned char *memory;
struct chunkHeader *chunkHeader;
struct chunkTrailer *chunkTrailer;
unsigned char *chunk;
checkIntegrity();
memory = (unsigned char *)malloc(length + sizeof(struct chunkHeader) + sizeof(struct chunkTrailer));
if (memory == NULL) {
fprintf(stderr, "Cannot allocate %u bytes, tag = %d\n", (unsigned int)(length + sizeof(struct chunkHeader) + sizeof(struct chunkTrailer)), tag);
exit(1);
}
chunkHeader = (struct chunkHeader *)memory;
chunk = memory + sizeof(struct chunkHeader);
chunkTrailer = (struct chunkTrailer *)(memory + sizeof(struct chunkHeader) + length);
chunkHeader->length = length;
chunkHeader->tag = tag;
chunkHeader->magicNumber = MAGIC_NUMBER;
chunkTrailer->magicNumber = MAGIC_NUMBER;
chunkHeader->next = chunkList;
chunkList = chunkHeader;
return chunk;
}
void *debugRealloc(void *memoryParameter, unsigned int length, int tag)
{
unsigned char *memory;
struct chunkHeader *chunkHeader;
struct chunkTrailer *chunkTrailer;
unsigned char *result;
unsigned int copyLength;
checkIntegrity();
if (memoryParameter) { /* if memoryParameter==NULL, realloc() should work like malloc() !! */
memory = (unsigned char *)memoryParameter;
chunkHeader = (struct chunkHeader *)(memory - sizeof(struct chunkHeader));
if (chunkHeader->magicNumber != MAGIC_NUMBER) {
fprintf(stderr, "Invalid magic number in header: %08x, tag = %d\n", chunkHeader->magicNumber, chunkHeader->tag);
exit(1);
}
chunkTrailer = (struct chunkTrailer *)(memory + chunkHeader->length);
if (chunkTrailer->magicNumber != MAGIC_NUMBER) {
fprintf(stderr, "Invalid magic number in header: %08x, tag = %d\n", chunkTrailer->magicNumber, chunkHeader->tag);
exit(1);
}
}
result = (unsigned char *)debugMalloc(length, tag);
if (memoryParameter) {
copyLength = length;
if (copyLength > chunkHeader->length)
copyLength = chunkHeader->length;
memcpy(result, memoryParameter, copyLength);
debugFree(memoryParameter);
}
return result;
}
void debugFree(void *memoryParameter)
{
unsigned char *memory;
struct chunkHeader *chunkHeader;
struct chunkTrailer *chunkTrailer;
struct chunkHeader *walker;
struct chunkHeader *previous;
checkIntegrity();
memory = (unsigned char *)memoryParameter;
chunkHeader = (struct chunkHeader *)(memory - sizeof(struct chunkHeader));
if (chunkHeader->magicNumber != MAGIC_NUMBER) {
fprintf(stderr, "Invalid magic number in header: %08x, tag = %d\n", chunkHeader->magicNumber, chunkHeader->tag);
exit(1);
}
previous = NULL;
for (walker = chunkList; walker != NULL; walker = walker->next) {
if (walker == chunkHeader)
break;
previous = walker;
}
if (walker == NULL) {
fprintf(stderr, "Double free detected, tag = %d\n", chunkHeader->tag);
exit(1);
}
if (previous == NULL)
chunkList = walker->next;
else
previous->next = walker->next;
chunkTrailer = (struct chunkTrailer *)(memory + chunkHeader->length);
if (chunkTrailer->magicNumber != MAGIC_NUMBER) {
fprintf(stderr, "Invalid magic number in header: %08x, tag = %d\n", chunkTrailer->magicNumber, chunkHeader->tag);
exit(1);
}
free(chunkHeader);
}
#else
void checkIntegrity(void)
{
}
void checkLeak(void)
{
}
void *debugMalloc(unsigned int length, int tag)
{
void *result;
result = malloc(length);
if (result == NULL) {
fprintf(stderr, "Cannot allocate %u bytes, tag = %d\n", length, tag);
exit(1);
}
return result;
}
void *debugRealloc(void *memory, unsigned int length, int tag)
{
void *result;
result = realloc(memory, length);
if (result == NULL) {
fprintf(stderr, "Cannot re-allocate %u bytes, tag = %d\n", length, tag);
exit(1);
}
return result;
}
void debugFree(void *memory)
{
free(memory);
}
#endif
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