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platform/x86: dell-wmi-sysman: Fix possible NULL pointer deref on exit 

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: e8a60aa740 ("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
This commit is contained in:
Hans de Goede 2021-03-21 12:58:56 +01:00
parent bdda39673f
commit ececdb8983
1 changed files with 2 additions and 9 deletions
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11
drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
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@ -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);
}
/**