linux-kernel - Re: [PATCH] kmod: Check for NULL at call_usermodehelper

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Message-Id: <201309160202.FBC60981.FQOHSLFMFtOJVO@I-love.SAKURA.ne.jp>
Date:	Mon, 16 Sep 2013 02:02:27 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	oleg@...hat.com
Cc:	viro@...iv.linux.org.uk, rostedt@...dmis.org, fweisbec@...il.com,
	mingo@...hat.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kmod: Check for NULL at call_usermodehelper_exec().

Oleg Nesterov wrote:
> It looks a bit ugly to check ->path under helper_lock(), just add
> 
> 	if (!sub_info->path)
> 		retval = -ENOENT;
> 
> at the start. Otherwise the code looks as if there is a subtle
> reason to take the lock before this check.

Did you mean this?

 	DECLARE_COMPLETION_ONSTACK(done);
 	int retval = 0;
 
+	if (!sub_info->path) {
+		call_usermodehelper_freeinfo(sub_info);
+		return -ENOENT;
+	}
 	helper_lock();
 	if (!khelper_wq || usermodehelper_disabled) {
 		retval = -EBUSY;
 		goto out;
 	}
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