diff options
| author | Ed Swierk <eswierk@arastra.com> | 2007-03-21 00:28:30 +0100 |
|---|---|---|
| committer | Adrian Bunk <bunk@stusta.de> | 2007-03-21 00:28:30 +0100 |
| commit | de37843b235a600c2402a44ab235d0d1634f82ca (patch) | |
| tree | 59e83d5fcd375bf0ca754d3c9fe8462e5935312b | |
| parent | 799a734f0342670020fd446532a22ddf4c0f3c08 (diff) | |
load_module: no BUG if module_subsys uninitialized
Invoking load_module() before param_sysfs_init() is called crashes in
mod_sysfs_setup(), since the kset in module_subsys is not initialized yet.
In my case, net-pf-1 is getting modprobed as a result of hotplug trying to
create a UNIX socket. Calls to hotplug begin after the topology_init
initcall.
Another patch for the same symptom (module_subsys-initialize-earlier.patch)
moves param_sysfs_init() to the subsys initcalls, but this is still not
early enough in the boot process in some cases. In particular,
topology_init() causes /sbin/hotplug to run, which requests net-pf-1 (the
UNIX socket protocol) which can be compiled as a module. Moving
param_sysfs_init() to the postcore initcalls fixes this particular race,
but there might well be other cases where a usermodehelper causes a module
to load earlier still.
The patch makes load_module() return an error rather than crashing the
kernel if invoked before module_subsys is initialized.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
| -rw-r--r-- | kernel/module.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/module.c b/kernel/module.c index 5aad477ddc79..5e2e2c27931d 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -1109,6 +1109,12 @@ static int mod_sysfs_setup(struct module *mod, { int err; + if (!module_subsys.kset.subsys) { + printk(KERN_ERR "%s: module_subsys not initialized\n", + mod->name); + err = -EINVAL; + goto out; + } memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); err = kobject_set_name(&mod->mkobj.kobj, "%s", mod->name); if (err) |