14 Aug
2008
14 Aug
'08
11:12 a.m.
See patch
--
coresystems GmbH • Brahmsstr. 16 • D-79104 Freiburg i. Br.
Tel.: +49 761 7668825 • Fax: +49 761 7664613
Email: info@coresystems.de • http://www.coresystems.de/
Registergericht: Amtsgericht Freiburg • HRB 7656
Geschäftsführer: Stefan Reinauer • Ust-IdNr.: DE245674866
* fix memory allocator bug that lead to freelist corruption on the first malloc
(and spent 8 bytes too much per malloc)
* if the memory allocator detects freelist corruption, print a message instead
of silently dying.
Signed-off-by: Stefan Reinauer stepan@coresystems.de
Index: libc/malloc.c
===================================================================
--- libc/malloc.c (revision 3509)
+++ libc/malloc.c (working copy)
@@ -92,13 +92,15 @@
header = *((hdrtype_t *) ptr);
int size = SIZE(header);
- if (!HAS_MAGIC(header) || size == 0)
+ if (!HAS_MAGIC(header) || size == 0) {
+ printf("memory allocator panic.\n");
halt();
+ }
if (header & FLAG_FREE) {
if (len <= size) {
void *nptr = ptr + (HDRSIZE + len);
- int nsize = size - (len + 8);
+ int nsize = size - (HDRSIZE + len);
/* Mark the block as used. */
*((hdrtype_t *) ptr) = USED_BLOCK(len);
@@ -109,7 +111,7 @@
if (nsize > 0)
*((hdrtype_t *) nptr) =
- FREE_BLOCK(nsize - 4);
+ FREE_BLOCK(nsize);
return (void *)(ptr + HDRSIZE);
}