linux-kernel - [PATCH] NFSD: Don't hold unrefcounted creds over call to nfsd

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Message-ID: <20090702133532.28297.89635.stgit@warthog.procyon.org.uk>
Date:	Thu, 02 Jul 2009 14:35:32 +0100
From:	David Howells <dhowells@...hat.com>
To:	bfields@...ldses.org, steved@...hat.com, rasmus@...onsult.dk
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	dhowells@...hat.com
Subject: [PATCH] NFSD: Don't hold unrefcounted creds over call to
	nfsd_setuser()

nfsd_open() gets an unrefcounted pointer to the current process's effective
credentials at the top of the function, then calls nfsd_setuser() via
fh_verify() - which may replace and destroy the current process's effective
credentials - and then passes the unrefcounted pointer to dentry_open() - but
the credentials may have been destroyed by this point.

Instead, the value from current_cred() should be passed directly to
dentry_open() as one of its arguments, rather than being cached in a variable.

Possibly fh_verify() should return the creds to use.

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/nfsd/vfs.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)


diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 4145083..23341c1 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -678,7 +678,6 @@ __be32
 nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 			int access, struct file **filp)
 {
-	const struct cred *cred = current_cred();
 	struct dentry	*dentry;
 	struct inode	*inode;
 	int		flags = O_RDONLY|O_LARGEFILE;
@@ -733,7 +732,7 @@ nfsd_open(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
 		vfs_dq_init(inode);
 	}
 	*filp = dentry_open(dget(dentry), mntget(fhp->fh_export->ex_path.mnt),
-			    flags, cred);
+			    flags, current_cred());
 	if (IS_ERR(*filp))
 		host_err = PTR_ERR(*filp);
 	else

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