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Diffstat (limited to 'grp/initgroups.c')
-rw-r--r--grp/initgroups.c23
1 files changed, 18 insertions, 5 deletions
diff --git a/grp/initgroups.c b/grp/initgroups.c
index 950ebfec0b..a74a703cfd 100644
--- a/grp/initgroups.c
+++ b/grp/initgroups.c
@@ -49,7 +49,7 @@ extern service_user *__nss_group_database;
static enum nss_status
compat_call (service_user *nip, const char *user, gid_t group, long int *start,
- long int *size, gid_t **groupsp, int *errnop)
+ long int *size, gid_t **groupsp, long int limit, int *errnop)
{
struct group grpbuf;
size_t buflen = __sysconf (_SC_GETGR_R_SIZE_MAX);
@@ -102,11 +102,22 @@ compat_call (service_user *nip, const char *user, gid_t group, long int *start,
{
/* Need a bigger buffer. */
gid_t *newgroups;
- newgroups = realloc (groups, 2 * *size * sizeof (*groups));
+ long int newsize;
+
+ if (limit > 0 && *size == limit)
+ /* We reached the maximum. */
+ goto done;
+
+ if (limit <= 0)
+ newsize = 2 * *size;
+ else
+ newsize = MIN (limit, 2 * *size);
+
+ newgroups = realloc (groups, newsize * sizeof (*groups));
if (newgroups == NULL)
goto done;
*groupsp = groups = newgroups;
- *size *= 2;
+ *size = newsize;
}
groups[*start] = grpbuf.gr_gid;
@@ -147,10 +158,12 @@ initgroups (user, group)
/* Start is one, because we have the first group as parameter. */
long int start = 1;
long int size;
+ long int limit;
gid_t *groups;
int result;
#ifdef NGROUPS_MAX
size = NGROUPS_MAX;
+ limit = -1;
#else
long int limit = __sysconf (_SC_NGROUPS_MAX);
@@ -184,14 +197,14 @@ initgroups (user, group)
if (fct == NULL)
{
status = compat_call (nip, user, group, &start, &size, &groups,
- &errno);
+ limit, &errno);
if (nss_next_action (nip, NSS_STATUS_UNAVAIL) != NSS_ACTION_CONTINUE)
break;
}
else
status = DL_CALL_FCT (fct, (user, group, &start, &size, &groups,
- &errno));
+ limit, &errno));
/* This is really only for debugging. */
if (NSS_STATUS_TRYAGAIN > status || status > NSS_STATUS_RETURN)