emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

id: correct getgroups usage

Browse Source 
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2011-06-22 16:42:36 +02:00
parent d5ac9c88a7
commit 52f4fe9db6
1 changed files with 15 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
coreutils/id.c
View File

@ -131,22 +131,21 @@ static int get_groups(const char *username, gid_t rgid, gid_t *groups, int *n)
m = getgrouplist(username, rgid, groups, n);
/* I guess *n < 0 might indicate error. Anyway,
* malloc'ing -1 bytes won't be good, so: */
//if (*n < 0)
// return 0;
//return m;
//commented out here, happens below anyway
} else {
/* On error -1 is returned, which ends up in *n */
int nn = getgroups(*n, groups);
/* 0: nn <= *n, groups[] was big enough; -1 otherwise */
m = - (nn > *n);
*n = nn;
}
if (*n < 0)
return 0; /* error, don't return < 0! */
return 0;
return m;
}
*n = getgroups(*n, groups);
if (*n >= 0)
return *n;
/* Error */
if (errno == EINVAL) /* *n is too small? */
*n = getgroups(0, groups); /* get needed *n */
/* if *n >= 0, return -1 (got new *n), else return 0 (error): */
return -(*n >= 0);
}
int id_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int id_main(int argc UNUSED_PARAM, char **argv)
{
@ -214,11 +213,11 @@ int id_main(int argc UNUSED_PARAM, char **argv)
/* We are supplying largish buffer, trying
* to not run get_groups() twice. That might be slow
* ("user database in remote SQL server" case) */
groups = xmalloc(64 * sizeof(gid_t));
groups = xmalloc(64 * sizeof(groups[0]));
n = 64;
if (get_groups(username, rgid, groups, &n) < 0) {
/* Need bigger buffer after all */
groups = xrealloc(groups, n * sizeof(gid_t));
groups = xrealloc(groups, n * sizeof(groups[0]));
get_groups(username, rgid, groups, &n);
}
if (n > 0) {