diff options
| -rw-r--r-- | malloc/hooks.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/malloc/hooks.c b/malloc/hooks.c index 8a1c16dfa4..6474ba8b38 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -315,7 +315,7 @@ realloc_check (void *oldmem, size_t bytes, const void *caller) __libc_lock_unlock (main_arena.mutex); if (!oldp) malloc_printerr ("realloc(): invalid pointer"); - const INTERNAL_SIZE_T oldchsize = CHUNK_AVAILABLE_SIZE (oldp); + const INTERNAL_SIZE_T oldsize = chunksize (oldp); if (!checked_request2size (rb, &chnb)) goto invert; @@ -331,7 +331,8 @@ realloc_check (void *oldmem, size_t bytes, const void *caller) else #endif { - if (oldchsize >= chnb) + /* Note the extra SIZE_SZ overhead. */ + if (oldsize - SIZE_SZ >= chnb) newmem = oldmem; /* do nothing */ else { @@ -340,7 +341,7 @@ realloc_check (void *oldmem, size_t bytes, const void *caller) newmem = _int_malloc (&main_arena, rb); if (newmem) { - memcpy (newmem, oldmem, oldchsize - CHUNK_HDR_SZ); + memcpy (newmem, oldmem, oldsize - CHUNK_HDR_SZ); munmap_chunk (oldp); } } @@ -349,7 +350,7 @@ realloc_check (void *oldmem, size_t bytes, const void *caller) else { top_check (); - newmem = _int_realloc (&main_arena, oldp, oldchsize, chnb); + newmem = _int_realloc (&main_arena, oldp, oldsize, chnb); } DIAG_PUSH_NEEDS_COMMENT; |