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-rw-r--r--libc/stdlib/malloc-930716/malloc.c22
-rw-r--r--libc/stdlib/malloc-930716/realloc.c38
-rw-r--r--libc/stdlib/malloc/malloc.c24
-rw-r--r--libc/stdlib/malloc/realloc.c12
4 files changed, 59 insertions, 37 deletions
diff --git a/libc/stdlib/malloc-930716/malloc.c b/libc/stdlib/malloc-930716/malloc.c
index dce32b90b..3e69f1140 100644
--- a/libc/stdlib/malloc-930716/malloc.c
+++ b/libc/stdlib/malloc-930716/malloc.c
@@ -15,6 +15,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <errno.h>
#include "malloc.h"
#ifdef __UCLIBC_HAS_THREADS__
@@ -161,19 +162,22 @@ void * __malloc_unlocked (size_t size)
struct list *next;
#if defined(__MALLOC_GLIBC_COMPAT__)
- if (size == 0)
+ if (unlikely(size == 0))
size++;
#else
/* Some programs will call malloc (0). Lets be strict and return NULL */
- if (size == 0)
- return NULL;
+ if (unlikely(size == 0))
+ goto oom;
#endif
+ /* Check if they are doing something dumb like malloc(-1) */
+ if (unlikely(((unsigned long)size > (unsigned long)(sizeof (struct list)*-2))))
+ goto oom;
- if (size < sizeof (struct list))
+ if (unlikely(size < sizeof (struct list)))
size = sizeof (struct list);
if (!initialized && !initialize()) {
- return NULL;
+ goto oom;
}
/* Determine the allocation policy based on the request size. */
@@ -204,7 +208,7 @@ void * __malloc_unlocked (size_t size)
and break it into fragments, returning the first. */
result = __malloc_unlocked(BLOCKSIZE);
if (!result) {
- return NULL;
+ goto oom;
}
++_fragblocks[log];
@@ -255,7 +259,7 @@ void * __malloc_unlocked (size_t size)
}
result = morecore(blocks * BLOCKSIZE);
if (!result) {
- return NULL;
+ goto oom;
}
block = BLOCK(result);
_heapinfo[block].busy.type = 0;
@@ -293,6 +297,10 @@ void * __malloc_unlocked (size_t size)
}
return result;
+
+oom:
+ __set_errno(ENOMEM);
+ return NULL;
}
/* Return memory to the heap. */
diff --git a/libc/stdlib/malloc-930716/realloc.c b/libc/stdlib/malloc-930716/realloc.c
index 2b486ced5..8215afa8d 100644
--- a/libc/stdlib/malloc-930716/realloc.c
+++ b/libc/stdlib/malloc-930716/realloc.c
@@ -15,6 +15,7 @@
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
+#include <errno.h>
#include "malloc.h"
#ifdef __UCLIBC_HAS_THREADS__
@@ -44,8 +45,7 @@ void * realloc (void *ptr, size_t size)
LOCK;
__free_unlocked(ptr);
result = __malloc_unlocked(0);
- UNLOCK;
- return(result);
+ goto alldone;
}
LOCK;
@@ -59,8 +59,7 @@ void * realloc (void *ptr, size_t size)
memcpy(result, ptr, size);
__free_unlocked(ptr);
}
- UNLOCK;
- return result;
+ goto alldone;
}
/* The new size is a large allocation as well; see if
@@ -74,12 +73,12 @@ void * realloc (void *ptr, size_t size)
= _heapinfo[block].busy.info.size - blocks;
_heapinfo[block].busy.info.size = blocks;
__free_unlocked(ADDRESS(block + blocks));
- UNLOCK;
- return ptr;
+ result = ptr;
+ goto alldone;
} else if (blocks == _heapinfo[block].busy.info.size) {
/* No size change necessary. */
- UNLOCK;
- return ptr;
+ result = ptr;
+ goto alldone;
} else {
/* Won't fit, so allocate a new region that will. Free
the old region first in case there is sufficient adjacent
@@ -102,13 +101,11 @@ void * realloc (void *ptr, size_t size)
__malloc_unlocked(blocks * BLOCKSIZE);
__free_unlocked(previous);
}
- UNLOCK;
- return NULL;
+ goto oom;
}
if (ptr != result)
memmove(result, ptr, blocks * BLOCKSIZE);
- UNLOCK;
- return result;
+ goto alldone;
}
break;
@@ -117,24 +114,29 @@ void * realloc (void *ptr, size_t size)
the fragment size. */
if ((size > 1 << (type - 1)) && (size <= 1 << type)) {
/* New size is the same kind of fragment. */
- UNLOCK;
- return ptr;
+ result = ptr;
+ goto alldone;
}
else {
/* New size is different; allocate a new space, and copy
the lesser of the new size and the old. */
result = __malloc_unlocked(size);
if (!result) {
- UNLOCK;
- return NULL;
+ goto oom;
}
memcpy(result, ptr, MIN(size, (size_t)(1 << type)));
__free_unlocked(ptr);
- UNLOCK;
- return result;
+ goto alldone;
}
break;
}
+alldone:
UNLOCK;
+ return result;
+
+oom:
+ UNLOCK;
+ __set_errno(ENOMEM);
+ return NULL;
}
diff --git a/libc/stdlib/malloc/malloc.c b/libc/stdlib/malloc/malloc.c
index 5f88cf48e..98ac41cd7 100644
--- a/libc/stdlib/malloc/malloc.c
+++ b/libc/stdlib/malloc/malloc.c
@@ -13,6 +13,7 @@
#include <stdlib.h>
#include <unistd.h>
+#include <errno.h>
#include <sys/mman.h>
#include "malloc.h"
@@ -173,6 +174,7 @@ malloc_from_heap (size_t size, struct heap *heap)
void *
malloc (size_t size)
{
+ void *mem;
#ifdef MALLOC_DEBUGGING
static int debugging_initialized = 0;
if (! debugging_initialized)
@@ -185,12 +187,22 @@ malloc (size_t size)
#endif
#if defined(__MALLOC_GLIBC_COMPAT__)
- if (size == 0)
- return 0;
-#else
- if (size == 0)
+ if (unlikely(size == 0))
size++;
+#else
+ /* Some programs will call malloc (0). Lets be strict and return NULL */
+ if (unlikely(size == 0))
+ goto oom;
#endif
-
- return malloc_from_heap (size, &__malloc_heap);
+ /* Check if they are doing something dumb like malloc(-1) */
+ if (unlikely(((unsigned long)size > (unsigned long)(MALLOC_HEADER_SIZE*-2))))
+ goto oom;
+
+ mem = malloc_from_heap (size, &__malloc_heap);
+ if (unlikely(!mem)) {
+oom:
+ __set_errno(ENOMEM);
+ return NULL;
+ }
+ return mem;
}
diff --git a/libc/stdlib/malloc/realloc.c b/libc/stdlib/malloc/realloc.c
index d4e0d9cb4..9e6f880fe 100644
--- a/libc/stdlib/malloc/realloc.c
+++ b/libc/stdlib/malloc/realloc.c
@@ -13,6 +13,7 @@
#include <stdlib.h>
#include <string.h>
+#include <errno.h>
#include "malloc.h"
#include "heap.h"
@@ -25,13 +26,12 @@ realloc (void *mem, size_t new_size)
char *base_mem;
/* Check for special cases. */
- if (! new_size)
- {
+ if (!mem)
+ return malloc(new_size);
+ if (!new_size) {
free (mem);
- return 0;
- }
- else if (! mem)
- return malloc (new_size);
+ return (malloc(new_size));
+ }
/* Normal realloc. */
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 14:23:17 +0000