staging: dgnc: return -ENOMEM when kzalloc failed

The kzalloc can be failed when memory is not enough
to allocate. When kzalloc failed, it need to return
error code with ENOMEM

Signed-off-by: Daeseok Youn <daeseok.youn@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 5832190c5ded7e99506731ee14f14a04574c8bac..7f73a4104ec31856c486847606a1b5455abff05b 100644 (file)
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -1106,6 +1106,14 @@ static int dgnc_tty_open(struct tty_struct *tty, struct file *file)
        if (!ch->ch_wqueue)
                ch->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL);
 
+       if (!ch->ch_rqueue || !ch->ch_equeue || !ch->ch_wqueue) {
+               kfree(ch->ch_rqueue);
+               kfree(ch->ch_equeue);
+               kfree(ch->ch_wqueue);
+
+               return -ENOMEM;
+       }
+
        spin_lock_irqsave(&ch->ch_lock, flags);
 
        ch->ch_flags &= ~(CH_OPENING);