5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Kurt Borja kuurtb@gmail.com
commit 9110056fe10b0519529bdbbac37311a5037ea0c2 upstream.
In tlmi_analyze(), allocated structs with an embedded kobject are freed in error paths after the they were already initialized.
Fix this by first by avoiding the initialization of kobjects in tlmi_analyze() and then by correctly cleaning them up in tlmi_release_attr() using their kset's kobject list.
Fixes: a40cd7ef22fb ("platform/x86: think-lmi: Add WMI interface support on Lenovo platforms") Fixes: 30e78435d3bf ("platform/x86: think-lmi: Split kobject_init() and kobject_add() calls") Cc: stable@vger.kernel.org Reviewed-by: Mark Pearson mpearson-lenovo@squebb.ca Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Signed-off-by: Kurt Borja kuurtb@gmail.com Link: https://lore.kernel.org/r/20250630-lmi-fix-v3-2-ce4f81c9c481@gmail.com Signed-off-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com [ Adapted kobject cleanup to only pwd_admin and pwd_power password types present in 5.15. ] Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/platform/x86/think-lmi.c | 27 +++++++++++++++------------ 1 file changed, 15 insertions(+), 12 deletions(-)
--- a/drivers/platform/x86/think-lmi.c +++ b/drivers/platform/x86/think-lmi.c @@ -765,25 +765,31 @@ static struct kobj_attribute debug_cmd = /* ---- Initialisation --------------------------------------------------------- */ static void tlmi_release_attr(void) { + struct kobject *pos, *n; int i;
/* Attribute structures */ for (i = 0; i < TLMI_SETTINGS_COUNT; i++) { if (tlmi_priv.setting[i]) { sysfs_remove_group(&tlmi_priv.setting[i]->kobj, &tlmi_attr_group); - kobject_put(&tlmi_priv.setting[i]->kobj); } } sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &pending_reboot.attr); if (tlmi_priv.can_debug_cmd && debug_support) sysfs_remove_file(&tlmi_priv.attribute_kset->kobj, &debug_cmd.attr); + + list_for_each_entry_safe(pos, n, &tlmi_priv.attribute_kset->list, entry) + kobject_put(pos); + kset_unregister(tlmi_priv.attribute_kset);
/* Authentication structures */ sysfs_remove_group(&tlmi_priv.pwd_admin->kobj, &auth_attr_group); - kobject_put(&tlmi_priv.pwd_admin->kobj); sysfs_remove_group(&tlmi_priv.pwd_power->kobj, &auth_attr_group); - kobject_put(&tlmi_priv.pwd_power->kobj); + + list_for_each_entry_safe(pos, n, &tlmi_priv.authentication_kset->list, entry) + kobject_put(pos); + kset_unregister(tlmi_priv.authentication_kset); }
@@ -851,8 +857,8 @@ static int tlmi_sysfs_init(void)
/* Build attribute */ tlmi_priv.setting[i]->kobj.kset = tlmi_priv.attribute_kset; - ret = kobject_add(&tlmi_priv.setting[i]->kobj, NULL, - "%s", tlmi_priv.setting[i]->display_name); + ret = kobject_init_and_add(&tlmi_priv.setting[i]->kobj, &tlmi_attr_setting_ktype, + NULL, "%s", tlmi_priv.setting[i]->display_name); if (ret) goto fail_create_attr;
@@ -872,7 +878,8 @@ static int tlmi_sysfs_init(void) } /* Create authentication entries */ tlmi_priv.pwd_admin->kobj.kset = tlmi_priv.authentication_kset; - ret = kobject_add(&tlmi_priv.pwd_admin->kobj, NULL, "%s", "Admin"); + ret = kobject_init_and_add(&tlmi_priv.pwd_admin->kobj, &tlmi_pwd_setting_ktype, + NULL, "%s", "Admin"); if (ret) goto fail_create_attr;
@@ -881,7 +888,8 @@ static int tlmi_sysfs_init(void) goto fail_create_attr;
tlmi_priv.pwd_power->kobj.kset = tlmi_priv.authentication_kset; - ret = kobject_add(&tlmi_priv.pwd_power->kobj, NULL, "%s", "System"); + ret = kobject_init_and_add(&tlmi_priv.pwd_power->kobj, &tlmi_pwd_setting_ktype, + NULL, "%s", "Power-on"); if (ret) goto fail_create_attr;
@@ -995,7 +1003,6 @@ static int tlmi_analyze(void) if (setting->possible_values) strreplace(setting->possible_values, ',', ';');
- kobject_init(&setting->kobj, &tlmi_attr_setting_ktype); tlmi_priv.setting[i] = setting; kfree(item); } @@ -1021,8 +1028,6 @@ static int tlmi_analyze(void) if (pwdcfg.password_state & TLMI_PAP_PWD) tlmi_priv.pwd_admin->valid = true;
- kobject_init(&tlmi_priv.pwd_admin->kobj, &tlmi_pwd_setting_ktype); - tlmi_priv.pwd_power = kzalloc(sizeof(struct tlmi_pwd_setting), GFP_KERNEL); if (!tlmi_priv.pwd_power) { ret = -ENOMEM; @@ -1038,8 +1043,6 @@ static int tlmi_analyze(void) if (pwdcfg.password_state & TLMI_POP_PWD) tlmi_priv.pwd_power->valid = true;
- kobject_init(&tlmi_priv.pwd_power->kobj, &tlmi_pwd_setting_ktype); - return 0;
fail_free_pwd_admin: