diff options
| author | Greg Kroah-Hartman <[email protected]> | 2009-12-17 07:07:19 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2010-01-20 15:03:31 -0800 |
| commit | 703625118069f9f8960d356676662d3db5a9d116 (patch) | |
| tree | fe46ee6784dee41dbb9b642a1f551a1adfa44710 | |
| parent | 18c576f950167ff3ec1e56dcbbec7b87288b3237 (diff) | |
tty: fix race in tty_fasync
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 <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Alan Cox <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Tavis Ormandy <[email protected]>
Cc: Jeff Dike <[email protected]>
Cc: Julien Tinnes <[email protected]>
Cc: Matt Mackall <[email protected]>
Cc: stable <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
| -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 f15df40bc318..c6f3b48be9dd 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -1951,8 +1951,8 @@ 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 { |