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tty: Make get_current_tty use a kref

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We now return a kref covered tty reference. That ensures the tty structure
doesn't go away when you have a return from get_current_tty. This is not
enough to protect you from most of the resources being freed behind your
back - yet.

[Updated to include fixes for SELinux problems found by Andrew Morton and
 an s390 leak found while debugging the former]

Signed-off-by: Alan Cox <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Alan Cox 2008-10-13 10:39:13 +01:00 • committed by Linus Torvalds
commit 452a00d2ee
4 changed files with 13 additions and 9 deletions
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3
drivers/s390/char/fs3270.c
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@ -430,11 +430,12 @@ fs3270_open(struct inode *inode, struct file *filp)
mutex_lock(&tty_mutex);
tty = get_current_tty();
if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
mutex_unlock(&tty_mutex);
tty_kref_put(tty);
rc = -ENODEV;
goto out;
}
minor = tty->index + RAW3270_FIRSTMINOR;
tty_kref_put(tty);
mutex_unlock(&tty_mutex);
}
/* Check if some other program is already using fullscreen mode. */