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Date: Fri, 27 Dec 2019 13:02:03 -0500 From: Sasha Levin <sashal@...nel.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: Aditya Pakki <pakki001@....edu>, Johannes Berg <johannes.berg@...el.com>, Sasha Levin <sashal@...nel.org>, linux-wireless@...r.kernel.org, netdev@...r.kernel.org Subject: [PATCH AUTOSEL 4.14 38/57] rfkill: Fix incorrect check to avoid NULL pointer dereference From: Aditya Pakki <pakki001@....edu> [ Upstream commit 6fc232db9e8cd50b9b83534de9cd91ace711b2d7 ] 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 <pakki001@....edu> Link: https://lore.kernel.org/r/20191215153409.21696-1-pakki001@umn.edu Signed-off-by: Johannes Berg <johannes.berg@...el.com> Signed-off-by: Sasha Levin <sashal@...nel.org> --- 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 2064c3a35ef8..b6388335fe66 100644 --- a/net/rfkill/core.c +++ b/net/rfkill/core.c @@ -998,10 +998,13 @@ 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; mutex_lock(&rfkill_global_mutex); -- 2.20.1
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