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| author | Armin Wolf <W_Armin@gmx.de> | 2023-09-25 16:28:18 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2023-10-04 11:52:17 +0200 |
| commit | 528ab3e605cabf2f9c9bd5944d3bfe15f6e94f81 (patch) | |
| tree | cfff5f66036d5c7aaee06ba85b9da0d1f64ad4e9 | |
| parent | bc3b6f59463ba9f4367a80331213db491766b5a1 (diff) | |
| download | vfs-528ab3e605cabf2f9c9bd5944d3bfe15f6e94f81.tar.gz | |
platform/x86: think-lmi: Fix reference leak
If a duplicate attribute is found using kset_find_obj(), a reference
to that attribute is returned which needs to be disposed accordingly
using kobject_put(). Move the setting name validation into a separate
function to allow for this change without having to duplicate the
cleanup code for this setting.
As a side note, a very similar bug was fixed in
commit 7295a996fdab ("platform/x86: dell-sysman: Fix reference leak"),
so it seems that the bug was copied from that driver.
Compile-tested only.
Fixes: 1bcad8e510b2 ("platform/x86: think-lmi: Fix issues with duplicate attributes")
Reviewed-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://lore.kernel.org/r/20230925142819.74525-2-W_Armin@gmx.de
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
| -rw-r--r-- | drivers/platform/x86/think-lmi.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c index 79346881cadb12..aee869769843f5 100644 --- a/drivers/platform/x86/think-lmi.c +++ b/drivers/platform/x86/think-lmi.c @@ -1248,6 +1248,24 @@ static void tlmi_release_attr(void) kset_unregister(tlmi_priv.authentication_kset); } +static int tlmi_validate_setting_name(struct kset *attribute_kset, char *name) +{ + struct kobject *duplicate; + + if (!strcmp(name, "Reserved")) + return -EINVAL; + + duplicate = kset_find_obj(attribute_kset, name); + if (duplicate) { + pr_debug("Duplicate attribute name found - %s\n", name); + /* kset_find_obj() returns a reference */ + kobject_put(duplicate); + return -EBUSY; + } + + return 0; +} + static int tlmi_sysfs_init(void) { int i, ret; @@ -1276,10 +1294,8 @@ static int tlmi_sysfs_init(void) continue; /* check for duplicate or reserved values */ - if (kset_find_obj(tlmi_priv.attribute_kset, tlmi_priv.setting[i]->display_name) || - !strcmp(tlmi_priv.setting[i]->display_name, "Reserved")) { - pr_debug("duplicate or reserved attribute name found - %s\n", - tlmi_priv.setting[i]->display_name); + if (tlmi_validate_setting_name(tlmi_priv.attribute_kset, + tlmi_priv.setting[i]->display_name) < 0) { kfree(tlmi_priv.setting[i]->possible_values); kfree(tlmi_priv.setting[i]); tlmi_priv.setting[i] = NULL; |