diff --git a/drivers/net/wan/cosa.c b/drivers/net/wan/cosa.c
index f6b000ddcd151da8b433cda58ed2daa27e544974..b7bfc0caa5dc8e2945dd31573fd2f764e2435d31 100644
--- a/drivers/net/wan/cosa.c
+++ b/drivers/net/wan/cosa.c
@@ -902,6 +902,7 @@ static ssize_t cosa_write(struct file *file,
 			chan->tx_status = 1;
 			spin_unlock_irqrestore(&cosa->lock, flags);
 			up(&chan->wsem);
+			kfree(kbuf);
 			return -ERESTARTSYS;
 		}
 	}