linux-kernel - sysfs_drop_dentry(): possible NULL dereference

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Date:	Mon, 19 Mar 2007 10:22:11 +0100
From:	Adrian Bunk <bunk@...sta.de>
To:	Oliver Neukum <oliver@...kum.org>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>,
	Maneesh Soni <maneesh@...ibm.com>, linux-kernel@...r.kernel.org
Subject: sysfs_drop_dentry(): possible NULL dereference

The Coverity checker spotted the following incorrect part of
commit 94bebf4d1b8e7719f0f3944c037a21cfd99a4af7:

<--  snip  -->

...
 void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent)
 {
        struct dentry * dentry = sd->s_dentry;
+       struct inode *inode;
 
        if (dentry) {
                spin_lock(&dcache_lock);
                spin_lock(&dentry->d_lock);
                if (!(d_unhashed(dentry) && dentry->d_inode)) {
+                       inode = dentry->d_inode;
+                       spin_lock(&inode->i_lock);
...

<--  snip  -->

If (!dentry->d_inode), then it's a NULL dereference.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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