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kernel/module: Fix mem leak in module_add_modinfo_attrs 

[ Upstream commit bc6f2a757d ]

In module_add_modinfo_attrs if sysfs_create_file
fails, we forget to free allocated modinfo_attrs
and roll back the sysfs files.

Fixes: 03e88ae1b1 ("[PATCH] fix module sysfs files reference counting")
Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Jessica Yu <jeyu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
YueHaibing 2019-06-11 23:00:07 +08:00 committed by Greg Kroah-Hartman
parent 9c49f7811f
commit 3015291b2f
1 changed files with 17 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
kernel/module.c
View File

@ -1694,6 +1694,8 @@ static int add_usage_links(struct module *mod)
return ret;
}
static void module_remove_modinfo_attrs(struct module *mod, int end);
static int module_add_modinfo_attrs(struct module *mod)
{
struct module_attribute *attr;
@ -1708,24 +1710,34 @@ static int module_add_modinfo_attrs(struct module *mod)
return -ENOMEM;
temp_attr = mod->modinfo_attrs;
for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) {
for (i = 0; (attr = modinfo_attrs[i]); i++) {
if (!attr->test || attr->test(mod)) {
memcpy(temp_attr, attr, sizeof(*temp_attr));
sysfs_attr_init(&temp_attr->attr);
error = sysfs_create_file(&mod->mkobj.kobj,
&temp_attr->attr);
if (error)
goto error_out;
++temp_attr;
}
}
return 0;
error_out:
if (i > 0)
module_remove_modinfo_attrs(mod, --i);
return error;
}
static void module_remove_modinfo_attrs(struct module *mod)
static void module_remove_modinfo_attrs(struct module *mod, int end)
{
struct module_attribute *attr;
int i;
for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) {
if (end >= 0 && i > end)
break;
/* pick a field to test for end of list */
if (!attr->attr.name)
break;
@ -1813,7 +1825,7 @@ static int mod_sysfs_setup(struct module *mod,
return 0;
out_unreg_modinfo_attrs:
module_remove_modinfo_attrs(mod);
module_remove_modinfo_attrs(mod, -1);
out_unreg_param:
module_param_sysfs_remove(mod);
out_unreg_holders:
@ -1849,7 +1861,7 @@ static void mod_sysfs_fini(struct module *mod)
{
}
static void module_remove_modinfo_attrs(struct module *mod)
static void module_remove_modinfo_attrs(struct module *mod, int end)
{
}
@ -1865,7 +1877,7 @@ static void init_param_lock(struct module *mod)
static void mod_sysfs_teardown(struct module *mod)
{
del_usage_links(mod);
module_remove_modinfo_attrs(mod);
module_remove_modinfo_attrs(mod, -1);
module_param_sysfs_remove(mod);
kobject_put(mod->mkobj.drivers_dir);
kobject_put(mod->holders_dir);