diff options
| author | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-17 07:07:19 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-01-25 10:49:15 -0800 |
| commit | 179b7e53797c61a7652075eb48c6008dbd2b88d5 (patch) | |
| tree | 6ff5e48f7a9c9d881763d143b9a896a4a96ed1e8 /drivers/char | |
| parent | b70922a1819f26c3962a184070d9370dfae634a9 (diff) | |
tty: fix race in tty_fasync
commit 703625118069f9f8960d356676662d3db5a9d116 upstream.
We need to keep the lock held over the call to __f_setown() to
prevent a PID race.
Thanks to Al Viro for pointing out the problem, and to Travis for
making us look here in the first place.
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Tavis Ormandy <taviso@google.com>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Julien Tinnes <jln@google.com>
Cc: Matt Mackall <mpm@selenic.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/tty_io.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index 59499ee0fe6..e919bd9c92d 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -1930,8 +1930,8 @@ static int tty_fasync(int fd, struct file *filp, int on) pid = task_pid(current); type = PIDTYPE_PID; } - spin_unlock_irqrestore(&tty->ctrl_lock, flags); retval = __f_setown(filp, pid, type, 0); + spin_unlock_irqrestore(&tty->ctrl_lock, flags); if (retval) goto out; } else { |