linux-kernel - [PATCH 04/10] kobject: kobj->k

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Date:	Fri, 16 Feb 2007 15:37:30 -0800
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Martin Stoilov <mstoilov@...sys.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 04/10] kobject: kobj->k_name verification fix

From: Martin Stoilov <mstoilov@...sys.com>

The function 'kobject_add' tries to verify the name of
a new kobject instance is properly set before continuing.
    if (!kobj->k_name)
        kobj->k_name = kobj->name;
    if (!kobj->k_name) {
        pr_debug("kobject attempted to be registered with no name!\n");
        WARN_ON(1);
        return -EINVAL;
    }
The statement:
    if (!kobj->k_name) {
        pr_debug("kobject attempted to be registered with no name!\n");
        WARN_ON(1);
        return -EINVAL;
    }
is useless the way it is right now, because it can never be true. I
think the
code was intended to be:
    if (!kobj->k_name)
        kobj->k_name = kobj->name;
    if (!*kobj->k_name) {
        pr_debug("kobject attempted to be registered with no name!\n");
        WARN_ON(1);
        return -EINVAL;
    }
because this would make sure the kobj->name buffer has something in it.
So the missing '*' is just a typo. Although, I would much prefer
expression like:
    if (*kobj->k_name == '\0') {
        pr_debug("kobject attempted to be registered with no name!\n");
        WARN_ON(1);
        return -EINVAL;
    }

because this would've made the intention clear, in this patch I just restore
the missing '*' without changing the coding style of the function.

Signed-off-by: Martin Stoilov <mstoilov@...sys.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 lib/kobject.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/kobject.c b/lib/kobject.c
index 2782f49..93685f4 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -171,7 +171,7 @@ int kobject_shadow_add(struct kobject * kobj, struct dentry *shadow_parent)
 		return -ENOENT;
 	if (!kobj->k_name)
 		kobj->k_name = kobj->name;
-	if (!kobj->k_name) {
+	if (!*kobj->k_name) {
 		pr_debug("kobject attempted to be registered with no name!\n");
 		WARN_ON(1);
 		return -EINVAL;
-- 
1.5.0

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