linux-kernel - Re: [PATCH 2.6.34-rc1] proc: fix badness in fs/proc/generic.c

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Message-ID: <20100421162704.GB13861@hack>
Date:	Thu, 22 Apr 2010 00:27:05 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	GuanJun He <heguanbo@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.34-rc1] proc: fix badness in fs/proc/generic.c

On Wed, Apr 21, 2010 at 07:09:42PM +0800, GuanJun He wrote:
>fix badness in fs/proc/generic.c,  Bug 15589 -  2.6.34-rc1: Badness at
>fs/proc/generic.c:316
>
>Signed-off-by: Guanjun He <heguanbo@...il.com>

NACK.

The callers of __xlate_proc_name() all hold proc_subdir_lock.

>
>---
>diff -Nupr linux-2.6.34-rc1.orig/fs/proc/generic.c
>linux-2.6.34-rc1/fs/proc/generic.c
>--- linux-2.6.34-rc1.orig/fs/proc/generic.c     2010-03-09
>02:45:44.000000000 +0800
>+++ linux-2.6.34-rc1/fs/proc/generic.c  2010-04-21 19:02:49.000000000 +0800
>@@ -297,11 +297,13 @@ static int __xlate_proc_name(const char
>        const char              *cp = name, *next;
>        struct proc_dir_entry   *de;
>        int                     len;
>+       int                     rtn = 0;
>
>        de = *ret;
>        if (!de)
>                de = &proc_root;
>
>+       spin_lock(&proc_subdir_lock);
>        while (1) {
>                next = strchr(cp, '/');
>                if (!next)
>@@ -313,14 +315,17 @@ static int __xlate_proc_name(const char
>                                break;
>                }
>                if (!de) {
>-                       WARN(1, "name '%s'\n", name);
>-                       return -ENOENT;
>+                       WARN(1, "name \"%s\"\n", name);
>+                       rtn = -ENOENT;
>+                       goto out;
>                }
>                cp += len + 1;
>        }
>        *residual = cp;
>        *ret = de;
>-       return 0;
>+out:
>+       spin_unlock(&proc_subdir_lock);
>+       return rtn;
> }
>
> static int xlate_proc_name(const char *name, struct proc_dir_entry **ret,
>--
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