From 6fc232db9e8cd50b9b83534de9cd91ace711b2d7 Mon Sep 17 00:00:00 2001 From: Aditya Pakki Date: Sun, 15 Dec 2019 09:34:08 -0600 Subject: [PATCH] rfkill: Fix incorrect check to avoid NULL pointer dereference 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 Link: https://lore.kernel.org/r/20191215153409.21696-1-pakki001@umn.edu Signed-off-by: Johannes Berg --- 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; mutex_lock(&rfkill_global_mutex);