diff options
Diffstat (limited to 'login')
| -rw-r--r-- | login/pututline_r.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/login/pututline_r.c b/login/pututline_r.c index 42994e899f..ada6059aae 100644 --- a/login/pututline_r.c +++ b/login/pututline_r.c @@ -62,8 +62,9 @@ pututline_r (const struct utmp *id, struct utmp_data *utmp_data) /* Check whether we need to reposition. Repositioning is necessary either if the data in UTMP_DATA is not valid or if the ids don't match: */ - if (utmp_data->loc_utmp < (off_t) sizeof (struct utmp) - || strncmp(utmp_data->ubuf.ut_id, id->ut_id, sizeof (id->ut_id)) != 0) + if (id->ut_id[0] + && (utmp_data->loc_utmp < (off_t) sizeof (struct utmp) + || strncmp(utmp_data->ubuf.ut_id, id->ut_id, sizeof (id->ut_id)) != 0)) { /* We must not overwrite the data in UTMP_DATA since ID may be aliasing it. */ |