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platform/x86: dell-sysman: Fix reference leak 

If a duplicate attribute is found using kset_find_obj(),
a reference to that attribute is returned. This means
that we need to dispose it accordingly. Use kobject_put()
to dispose the duplicate attribute in such a case.

Compile-tested only.

Fixes: e8a60aa740 ("platform/x86: Introduce support for Systems Management Driver over WMI for Dell Systems")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20230805053610.7106-1-W_Armin@gmx.de
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Armin Wolf 2023-08-05 07:36:10 +02:00 committed by Hans de Goede
parent 6f8972a02a
commit 7295a996fd
1 changed files with 6 additions and 3 deletions
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9
drivers/platform/x86/dell/dell-wmi-sysman/sysman.c
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@ -393,6 +393,7 @@ static int init_bios_attributes(int attr_type, const char *guid)
struct kobject *attr_name_kobj; //individual attribute names
union acpi_object *obj = NULL;
union acpi_object *elements;
struct kobject *duplicate;
struct kset *tmp_set;
int min_elements;
@ -451,9 +452,11 @@ static int init_bios_attributes(int attr_type, const char *guid)
else
tmp_set = wmi_priv.main_dir_kset;
if (kset_find_obj(tmp_set, elements[ATTR_NAME].string.pointer)) {
pr_debug("duplicate attribute name found - %s\n",
elements[ATTR_NAME].string.pointer);
duplicate = kset_find_obj(tmp_set, elements[ATTR_NAME].string.pointer);
if (duplicate) {
pr_debug("Duplicate attribute name found - %s\n",
elements[ATTR_NAME].string.pointer);
kobject_put(duplicate);
goto nextobj;
}