diff options
| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-03-18 19:45:44 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-03-18 21:40:06 +0100 |
| commit | d9c1e9a8fff512bb6c43461181d4360f1c8cfd6d (patch) | |
| tree | d77f4e779065c7d52a6b17cca5fb1a23fac505a7 /drivers | |
| parent | [PATCH] gpio_direction_output-needs-an-initial-value fix (diff) | |
| download | linux-d9c1e9a8fff512bb6c43461181d4360f1c8cfd6d.tar.xz linux-d9c1e9a8fff512bb6c43461181d4360f1c8cfd6d.zip | |
[PATCH] tty: Fix two reported pid leaks
These leaks were reported by: Catalin Marinas <catalin.marians@gmail.com>
and I have been able to very by inspection they are possible.
When converting tty_io.c to store pids as struct pid pointers instead
of pid_t values it appears I overlooked two places where we stop using
the pid value. The very obvious one is in do_tty_hangup, and the one
the less obvious one in __proc_set_tty.
When looking into the code __proc_set_tty only has pids that need to
be put because of failures of other parts of the code to properly
perform hangup processing. Fixing the leak here in __proc_set_tty
is easy and obviously correct so I am doing that first.
Fixing the places that should be performing hangup processing is much
less obviously correct. So those I'm aiming those patches at -mm.
for now, so the can age a while before they are merged.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/char/tty_io.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index e45326856680..7a32df594907 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -1376,6 +1376,8 @@ static void do_tty_hangup(struct work_struct *work) read_unlock(&tasklist_lock); tty->flags = 0; + put_pid(tty->session); + put_pid(tty->pgrp); tty->session = NULL; tty->pgrp = NULL; tty->ctrl_status = 0; @@ -3841,6 +3843,9 @@ static struct pid *__proc_set_tty(struct task_struct *tsk, struct tty_struct *tt { struct pid *old_pgrp; if (tty) { + /* We should not have a session or pgrp to here but.... */ + put_pid(tty->session); + put_pid(tty->pgrp); tty->session = get_pid(task_session(tsk)); tty->pgrp = get_pid(task_pgrp(tsk)); } |