The patch titled
dquot: add proper locking when using current->signal->tty
has been added to the -mm tree. Its filename is
dquot-add-proper-locking-when-using-current-signal-tty.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: dquot: add proper locking when using current->signal->tty
From: Jan Kara <jack@xxxxxxx>
Dquot passes the tty to tty_write_message without locking
Signed-off-by: Jan Kara <jack@xxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
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)
_
Patches currently in -mm which might be from jack@xxxxxxx are
dquot-add-proper-locking-when-using-current-signal-tty.patch
-
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