forked from luck/tmp_suning_uos_patched
module: Wait for RCU synchronizing before releasing a module
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>
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@ -3326,6 +3326,8 @@ static int load_module(struct load_info *info, const char __user *uargs,
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/* Unlink carefully: kallsyms could be walking list. */
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list_del_rcu(&mod->list);
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wake_up_all(&module_wq);
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/* Wait for RCU synchronizing before releasing mod->list. */
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synchronize_rcu();
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mutex_unlock(&module_mutex);
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free_module:
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module_deallocate(mod, info);
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