linux-kernel - [PATCH] hdlcdrv: replace assertion with recovery code

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Message-Id: <20191215175842.30767-1-pakki001@umn.edu>
Date:   Sun, 15 Dec 2019 11:58:41 -0600
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Markus Elfring <elfring@...rs.sourceforge.net>,
        Richard Fontana <rfontana@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] hdlcdrv: replace assertion with recovery code

In hdlcdrv_register, failure to register the driver causes a crash.
However, by returning the error to the caller in case ops is NULL
can avoid the crash. The patch fixes this issue.

Signed-off-by: Aditya Pakki <pakki001@....edu>
---
 drivers/net/hamradio/hdlcdrv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index df495b5595f5..38e5d1e54800 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -687,7 +687,8 @@ struct net_device *hdlcdrv_register(const struct hdlcdrv_ops *ops,
 	struct hdlcdrv_state *s;
 	int err;
 
-	BUG_ON(ops == NULL);
+	if (!ops)
+		return ERR_PTR(-EINVAL);
 
 	if (privsize < sizeof(struct hdlcdrv_state))
 		privsize = sizeof(struct hdlcdrv_state);
-- 
2.20.1