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Distinguish invalid free()s between corrupted magic and invalid pointer

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This commit is contained in:
Martin Willi
2009-10-05 11:02:54 +02:00
parent fc12e3cd2e
commit 587ebae722
1 changed files with 24 additions and 5 deletions
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src/libstrongswan/utils/leak_detective.c
+24 -5
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@@ -346,12 +346,13 @@ void *malloc_hook(size_t bytes, const void *caller)
*/
void free_hook(void *ptr, const void *caller)
{
memory_header_t *hdr;
memory_header_t *hdr, *current;
memory_tail_t *tail;
backtrace_t *backtrace;
pthread_t thread_id = pthread_self();
int oldpolicy;
struct sched_param oldparams, params;
bool found = FALSE;
/* allow freeing of NULL */
if (ptr == NULL)
@@ -371,9 +372,26 @@ void free_hook(void *ptr, const void *caller)
if (hdr->magic != MEMORY_HEADER_MAGIC ||
tail->magic != MEMORY_TAIL_MAGIC)
{
fprintf(stderr, "freeing invalid memory (%p): "
"header magic 0x%x, tail magic 0x%x:\n",
ptr, hdr->magic, tail->magic);
for (current = &first_header; current != NULL; current = current->next)
{
if (current == hdr)
{
found = TRUE;
break;
}
}
if (found)
{
/* memory was allocated by our hooks but is corrupted */
fprintf(stderr, "freeing corrupted memory (%p): "
"header magic 0x%x, tail magic 0x%x:\n",
ptr, hdr->magic, tail->magic);
}
else
{
/* memory was not allocated by our hooks */
fprintf(stderr, "freeing invalid memory (%p)", ptr);
}
backtrace = backtrace_create(3);
backtrace->log(backtrace, stderr);
backtrace->destroy(backtrace);
@@ -389,7 +407,8 @@ void free_hook(void *ptr, const void *caller)
hdr->backtrace->destroy(hdr->backtrace);
/* clear MAGIC, set mem to something remarkable */
memset(hdr, MEMORY_FREE_PATTERN, hdr->bytes + sizeof(memory_header_t));
memset(hdr, MEMORY_FREE_PATTERN,
sizeof(memory_header_t) + hdr->bytes + sizeof(memory_tail_t));
free(hdr);
}