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tty: double unlock on error in ptmx_open()

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The problem here is that we called mutex_unlock(&devpts_mutex) on the
error path when we weren't holding the lock.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2012-07-11 09:40:40 +03:00 committed by Greg Kroah-Hartman
parent 157a4b311c
commit 79d7532092
1 changed files with 1 additions and 3 deletions
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4
drivers/tty/pty.c
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@ -618,13 +618,12 @@ static int ptmx_open(struct inode *inode, struct file *filp)
/* find a device that is not in use. */
mutex_lock(&devpts_mutex);
index = devpts_new_index(inode);
mutex_unlock(&devpts_mutex);
if (index < 0) {
retval = index;
goto err_file;
}
mutex_unlock(&devpts_mutex);
mutex_lock(&tty_mutex);
tty = tty_init_dev(ptm_driver, index);
@ -659,7 +658,6 @@ static int ptmx_open(struct inode *inode, struct file *filp)
mutex_unlock(&tty_mutex);
devpts_kill_index(inode, index);
err_file:
mutex_unlock(&devpts_mutex);
tty_free_file(filp);
return retval;
}