linux-kernel - [Patch] kernel: bug fixing for kernel/kmod.c

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Message-ID: <20060801172024.GA24303@kenny>
Date:	Wed, 2 Aug 2006 01:20:24 +0800
From:	kenny <nek.in.cn@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	torvalds@...l.org
Subject: [Patch] kernel: bug fixing for kernel/kmod.c

I think there is a bug in kmod.c. In __call_usermodehelper(), when 
kernel_thread(wait_for_helper, ...) return success, since
wait_for_helper() might call complete() at any time, the sub_info should
not be used any more.

the following patch is made in 2.6.17.7

--- kmod.c      2006-07-25 11:36:01.000000000 +0800
+++ /tmp/kmod.c 2006-08-02 01:01:42.702054000 +0800
@@ -198,6 +198,7 @@ static void __call_usermodehelper(void *
 {
        struct subprocess_info *sub_info = data;
        pid_t pid;
+       int wait = sub_info->wait;

        /* CLONE_VFORK: wait until the usermode helper has execve'd
         * successfully We need the data structures to stay around
@@ -212,7 +213,7 @@ static void __call_usermodehelper(void *
        if (pid < 0) {
                sub_info->retval = pid;
                complete(sub_info->complete);
-       } else if (!sub_info->wait)
+       } else if (!wait)
                complete(sub_info->complete);
 }

-- 
-
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