linux-kernel - Re: [NFS] [RFC: 2.6 patch] include/linux/nfsd/nfsfh.h: fix a NULL

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Date:	Sun, 12 Nov 2006 10:58:47 -0500
From:	Trond Myklebust <trond.myklebust@....uio.no>
To:	Adrian Bunk <bunk@...sta.de>
Cc:	neilb@....unsw.edu.au, nfs@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: Re: [NFS] [RFC: 2.6 patch] include/linux/nfsd/nfsfh.h: fix a NULL

On Sun, 2006-11-12 at 14:17 +0100, Adrian Bunk wrote:
> dereference
> Reply-To: 
> Fcc: =sent-mail
> 
> When we know fhp->fh_dentry is NULL, a code path where it's being 
> dereferenced isn't a good choice.
> 
> Spotted by the coverity checker.
> 
> Signed-off-by: Adrian Bunk <bunk@...sta.de>
> 
> --- linux-2.6/include/linux/nfsd/nfsfh.h.old	2006-11-12 14:13:34.000000000 +0100
> +++ linux-2.6/include/linux/nfsd/nfsfh.h	2006-11-12 14:13:49.000000000 +0100
> @@ -330,8 +330,7 @@ fh_unlock(struct svc_fh *fhp)
>  {
>  	if (!fhp->fh_dentry)
>  		printk(KERN_ERR "fh_unlock: fh not verified!\n");
> -
> -	if (fhp->fh_locked) {
> +	else if (fhp->fh_locked) {
>  		fill_post_wcc(fhp);
>  		mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
>  		fhp->fh_locked = 0;
> 

This issue has come up on lkml before. Please just convert that check
for fhp->fh_dentry into a BUG_ON().

Trond

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