Re: Unable to handle kernel NULL pointer dereference

[Greg KH <greg@kroah.com>]

On Thu, Jan 01, 2004 at 07:44:50PM +0100, Eduard <master^shadow> Roccatello wrote:
> Hi there,
> 
> i got an oops on USB mouse disconnect. i have tried to reproduce the oops 
> but it happened only once. I'm running 2.6.0 vanilla with nvidia binary 
> drivers but they not seems to be involved in the oops (imho).
> USB modules i use are: hid, hcd-ohci, hcd-ehci

There is a patch in the -mm tree to fix this.  I've included it here
below.

thanks,

greg k-h


diff -Nru a/fs/sysfs/dir.c b/fs/sysfs/dir.c
--- a/fs/sysfs/dir.c	Mon Dec 22 16:02:07 2003
+++ b/fs/sysfs/dir.c	Mon Dec 22 16:02:07 2003
@@ -83,7 +83,8 @@
 	struct dentry * parent = dget(d->d_parent);
 	down(&parent->d_inode->i_sem);
 	d_delete(d);
-	simple_rmdir(parent->d_inode,d);
+	if (d->d_inode)
+		simple_rmdir(parent->d_inode,d);
 
 	pr_debug(" o %s removing done (%d)\n",d->d_name.name,
 		 atomic_read(&d->d_count));