tty: fix race in tty_fasync
commit703625118069f9f8960d356676662d3db5a9d116
authorGreg Kroah-Hartman <gregkh@suse.de>
Thu, 17 Dec 2009 15:07:19 +0000 (17 07:07 -0800)
committerGreg Kroah-Hartman <gregkh@suse.de>
Wed, 20 Jan 2010 23:03:31 +0000 (20 15:03 -0800)
treefe46ee6784dee41dbb9b642a1f551a1adfa44710
parent18c576f950167ff3ec1e56dcbbec7b87288b3237
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 <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>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/char/tty_io.c