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authorDavid Howells <dhowells@redhat.com>2009-07-02 14:35:32 +0100
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-07-03 10:21:10 -0400
commit033a666ccb842ab4134fcd0c861d5ba9f5d6bf3a (patch)
tree95da0764ea928ce4f821023e23a25001297c7bf3
parent28d0325ce6e0a52f53d8af687e6427fee59004d3 (diff)
downloadlinux-stericsson-033a666ccb842ab4134fcd0c861d5ba9f5d6bf3a.tar.gz
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. This is a regression introduced by 745ca2475a6ac596e3d8d37c2759c0fbe2586227 "CRED: Pass credentials through dentry_open()". Signed-off-by: David Howells <dhowells@redhat.com> Tested-and-Verified-By: Steve Dickson <steved@redhat.com> Cc: stable@kernel.org Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
-rw-r--r--fs/nfsd/vfs.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 4145083dcf88..23341c1063bc 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