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authorEd Swierk <eswierk@arastra.com>2007-03-21 00:28:30 +0100
committerAdrian Bunk <bunk@stusta.de>2007-03-21 00:28:30 +0100
commitde37843b235a600c2402a44ab235d0d1634f82ca (patch)
tree59e83d5fcd375bf0ca754d3c9fe8462e5935312b /kernel
parent799a734f0342670020fd446532a22ddf4c0f3c08 (diff)
downloadlinux-linaro-stable-de37843b235a600c2402a44ab235d0d1634f82ca.tar.gz
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/module.c6
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)