From: Jan Kara <jack@suse.cz>

Dquot passes the tty to tty_write_message without locking

Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 fs/dquot.c |    5 +++++
 1 files changed, 5 insertions(+)

diff -puN fs/dquot.c~dquot-add-proper-locking-when-using-current-signal-tty fs/dquot.c
--- a/fs/dquot.c~dquot-add-proper-locking-when-using-current-signal-tty
+++ a/fs/dquot.c
@@ -834,6 +834,9 @@ static void print_warning(struct dquot *
 	if (!need_print_warning(dquot) || (flag && test_and_set_bit(flag, &dquot->dq_flags)))
 		return;
 
+	mutex_lock(&tty_mutex);
+	if (!current->signal->tty)
+		goto out_lock;
 	tty_write_message(current->signal->tty, dquot->dq_sb->s_id);
 	if (warntype == ISOFTWARN || warntype == BSOFTWARN)
 		tty_write_message(current->signal->tty, ": warning, ");
@@ -861,6 +864,8 @@ static void print_warning(struct dquot *
 			break;
 	}
 	tty_write_message(current->signal->tty, msg);
+out_lock:
+	mutex_unlock(&tty_mutex);
 }
 
 static inline void flush_warnings(struct dquot **dquots, char *warntype)
_