diff options
Diffstat (limited to 'grp/initgroups.c')
| -rw-r--r-- | grp/initgroups.c | 27 |
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) |