linux-kernel - [20/39] tty: Fix unbalanced BKL handling in error path

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Message-Id: <20100524231814.995659071@clark.site>
Date:	Mon, 24 May 2010 16:15:32 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Alan Cox <alan@...ux.intel.com>, Arnd Bergmann <arnd@...db.de>
Subject: [20/39] tty: Fix unbalanced BKL handling in error path


2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Alan Cox <alan@...ux.intel.com>

commit 77945febbe60a69e9dcab7f49d33a1aa1e436973 upstream.

Arnd noted:

After the "retry_open:" label, we first get the tty_mutex
and then the BKL. However a the end of tty_open, we jump
back to retry_open with the BKL still held. If we run into
this case, the tty_open function will be left with the BKL
still held.

Signed-off-by: Alan Cox <alan@...ux.intel.com>
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1875,6 +1875,7 @@ got_driver:
 		 */
 		if (filp->f_op == &hung_up_tty_fops)
 			filp->f_op = &tty_fops;
+		unlock_kernel();
 		goto retry_open;
 	}
 	unlock_kernel();


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