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From: Greg KH on 25 May 2010 14:30
2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------

From: Oleg Nesterov <oleg(a)redhat.com>

commit 6da8d866d0d39e9509ff826660f6a86a6757c966 upstream.

release_one_tty(tty) can be called when tty still has a reference
to pgrp/session. In this case we leak the pid.

Signed-off-by: Oleg Nesterov <oleg(a)redhat.com>
Reported-by: Catalin Marinas <catalin.marinas(a)arm.com>
Reported-and-tested-by: Tetsuo Handa <penguin-kernel(a)I-love.SAKURA.ne.jp>
Acked-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Acked-by: Eric W. Biederman <ebiederm(a)xmission.com>
Signed-off-by: Linus Torvalds <torvalds(a)linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
drivers/char/tty_io.c | 2 ++
1 file changed, 2 insertions(+)

--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1893,6 +1893,8 @@ static void release_one_tty(struct tty_s
list_del_init(&tty->tty_files);
file_list_unlock();

+ put_pid(tty->pgrp);
+ put_pid(tty->session);
free_tty_struct(tty);
}



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