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From: Aditya Pakki <>
Cc:, Johannes Berg <>,
	"David S. Miller" <>,,,
Subject: [PATCH] rfkill: Fix incorrect check to avoid NULL pointer dereference
Date: Sun, 15 Dec 2019 09:34:08 -0600
Message-ID: <> (raw)

In rfkill_register, the struct rfkill pointer is first derefernced
and then checked for NULL. This patch removes the BUG_ON and returns
an error to the caller in case rfkill is NULL.

Signed-off-by: Aditya Pakki <>
 net/rfkill/core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/rfkill/core.c b/net/rfkill/core.c
index 461d75274fb3..971c73c7d34c 100644
--- a/net/rfkill/core.c
+++ b/net/rfkill/core.c
@@ -1002,10 +1002,13 @@ static void rfkill_sync_work(struct work_struct *work)
 int __must_check rfkill_register(struct rfkill *rfkill)
 	static unsigned long rfkill_no;
-	struct device *dev = &rfkill->dev;
+	struct device *dev;
 	int error;
-	BUG_ON(!rfkill);
+	if (!rfkill)
+		return -EINVAL;
+	dev = &rfkill->dev;

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