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| author | joerg <joerg@FreeBSD.org> | 1996-10-28 07:47:34 +0000 |
|---|---|---|
| committer | joerg <joerg@FreeBSD.org> | 1996-10-28 07:47:34 +0000 |
| commit | 2b0d357ce4408ba1b7b5b5a12289ff8d6a240be8 (patch) | |
| tree | 9512b6a560cea3099302ee8e659e1af151e6772c /usr.bin/last/last.c | |
| parent | 89ffae8fb207c772c825863b2c2754e09a59c212 (diff) | |
| download | FreeBSD-src-2b0d357ce4408ba1b7b5b5a12289ff8d6a240be8.zip FreeBSD-src-2b0d357ce4408ba1b7b5b5a12289ff8d6a240be8.tar.gz | |
Don't dereference a free()ed pointer.
Closes PR bin/1909: 'last' coredumps if MALLOC_OPTIONS...
Diffstat (limited to 'usr.bin/last/last.c')
| -rw-r--r-- | usr.bin/last/last.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/usr.bin/last/last.c b/usr.bin/last/last.c index 89dcef8..25a7627 100644 --- a/usr.bin/last/last.c +++ b/usr.bin/last/last.c @@ -162,7 +162,7 @@ void wtmp() { struct utmp *bp; /* current structure */ - struct ttytab *tt; /* ttylist entry */ + struct ttytab *tt, *ttx; /* ttylist entry */ struct stat stb; /* stat of file for size */ long bl, delta; /* time difference */ int bytes, wfd; @@ -191,9 +191,11 @@ wtmp() */ if (bp->ut_line[0] == '~' && !bp->ut_line[1]) { /* everybody just logged out */ - for (tt = ttylist.lh_first; tt; tt = tt->list.le_next) { + for (tt = ttylist.lh_first; tt;) { LIST_REMOVE(tt, list); - free(tt); + ttx = tt; + tt = tt->list.le_next; + free(ttx); } currentout = -bp->ut_time; crmsg = strncmp(bp->ut_name, "shutdown", |
