From: Hans de Goede hdegoede@redhat.com
[ Upstream commit c59ab4cedab70a1a117a2dba3c48bb78e66c55ca ]
It is possible for release_attributes_data() to get called when the main_dir_kset has not been created yet, move the removal of the bios-reset sysfs attr to under a if (main_dir_kset) check to avoid a NULL pointer deref.
Fixes: e8a60aa7404b ("platform/x86: Introduce support for Systems Management Driver over WMI for Dell Systems") Cc: Divya Bharathi Divya_Bharathi@dell.com Cc: Mario Limonciello mario.limonciello@dell.com Reported-by: Alexander Naumann alexandernaumann@gmx.de Signed-off-by: Hans de Goede hdegoede@redhat.com Link: https://lore.kernel.org/r/20210321115901.35072-3-hdegoede@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/dell-wmi-sysman/sysman.c | 11 ++--------- 1 file changed, 2 insertions(+), 9 deletions(-)
diff --git a/drivers/platform/x86/dell-wmi-sysman/sysman.c b/drivers/platform/x86/dell-wmi-sysman/sysman.c index c1997db74cca..8b251b2c37a2 100644 --- a/drivers/platform/x86/dell-wmi-sysman/sysman.c +++ b/drivers/platform/x86/dell-wmi-sysman/sysman.c @@ -225,12 +225,6 @@ static int create_attributes_level_sysfs_files(void) return ret; }
-static void release_reset_bios_data(void) -{ - sysfs_remove_file(&wmi_priv.main_dir_kset->kobj, &reset_bios.attr); - sysfs_remove_file(&wmi_priv.main_dir_kset->kobj, &pending_reboot.attr); -} - static ssize_t wmi_sysman_attr_show(struct kobject *kobj, struct attribute *attr, char *buf) { @@ -373,8 +367,6 @@ static void destroy_attribute_objs(struct kset *kset) */ static void release_attributes_data(void) { - release_reset_bios_data(); - mutex_lock(&wmi_priv.mutex); exit_enum_attributes(); exit_int_attributes(); @@ -386,12 +378,13 @@ static void release_attributes_data(void) wmi_priv.authentication_dir_kset = NULL; } if (wmi_priv.main_dir_kset) { + sysfs_remove_file(&wmi_priv.main_dir_kset->kobj, &reset_bios.attr); + sysfs_remove_file(&wmi_priv.main_dir_kset->kobj, &pending_reboot.attr); destroy_attribute_objs(wmi_priv.main_dir_kset); kset_unregister(wmi_priv.main_dir_kset); wmi_priv.main_dir_kset = NULL; } mutex_unlock(&wmi_priv.mutex); - }
/**