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-rw-r--r--grp/initgroups.c27
1 files changed, 12 insertions, 15 deletions
diff --git a/grp/initgroups.c b/grp/initgroups.c
index d052cf4..2e48946 100644
--- a/grp/initgroups.c
+++ b/grp/initgroups.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1989,91,93,1996-2003, 2004 Free Software Foundation, Inc.
+/* Copyright (C) 1989,91,93,1996-2005,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@@ -17,6 +17,7 @@
02111-1307 USA. */
#include <alloca.h>
+#include <assert.h>
#include <errno.h>
#include <grp.h>
#include <limits.h>
@@ -73,6 +74,8 @@ internal_getgrouplist (const char *user, gid_t group, long int *size,
/* Start is one, because we have the first group as parameter. */
long int start = 1;
+ /* Never store more than the starting *SIZE number of elements. */
+ assert (*size > 0);
(*groupsp)[0] = group;
if (__nss_group_database != NULL)
@@ -140,11 +143,9 @@ internal_getgrouplist (const char *user, gid_t group, long int *size,
int
getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)
{
- gid_t *newgroups;
long int size = MAX (1, *ngroups);
- int result;
- newgroups = (gid_t *) malloc ((size + 1) * sizeof (gid_t));
+ gid_t *newgroups = (gid_t *) malloc (size * sizeof (gid_t));
if (__builtin_expect (newgroups == NULL, 0))
/* No more memory. */
// XXX This is wrong. The user provided memory, we have to use
@@ -153,20 +154,16 @@ getgrouplist (const char *user, gid_t group, gid_t *groups, int *ngroups)
// XXX too small. For initgroups a flag could say: increase size.
return -1;
- result = internal_getgrouplist (user, group, &size, &newgroups, -1);
-
- memcpy (groups, newgroups, MIN (*ngroups, result) * sizeof (gid_t));
+ int total = internal_getgrouplist (user, group, &size, &newgroups, -1);
- if (result > *ngroups)
- {
- *ngroups = result;
- result = -1;
- }
- else
- *ngroups = result;
+ memcpy (groups, newgroups, MIN (*ngroups, total) * sizeof (gid_t));
free (newgroups);
- return result;
+
+ int retval = total > *ngroups ? -1 : total;
+ *ngroups = total;
+
+ return retval;
}
static_link_warning (getgrouplist)