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module: Wait for RCU synchronizing before releasing a module

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Wait for RCU synchronizing on failure path of module loading
before releasing struct module, because the memory of mod->list
can still be accessed by list walkers (e.g. kallsyms).

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Masami Hiramatsu 2014-11-10 09:26:29 +10:30 committed by Rusty Russell
parent 0df1f2487d
commit 4f48795b61
1 changed files with 2 additions and 0 deletions
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2
kernel/module.c
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@ -3326,6 +3326,8 @@ static int load_module(struct load_info *info, const char __user *uargs,
/* Unlink carefully: kallsyms could be walking list. */
list_del_rcu(&mod->list);
wake_up_all(&module_wq);
/* Wait for RCU synchronizing before releasing mod->list. */
synchronize_rcu();
mutex_unlock(&module_mutex);
free_module:
module_deallocate(mod, info);