diff options
Diffstat (limited to 'grp/initgroups.c')
| -rw-r--r-- | grp/initgroups.c | 23 |
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) |