[PATCH 04/16] nfsd: make exp_rootfh handle exp_parent errors

[J. Bruce Fields]

From: J. Bruce Fields <bfields at fieldses.org>

Since exp_parent can fail by returning an error in addition to by returning
NULL, we should check for that case in exp_rootfh.

(TODO: we should check that userland handles these errors too.)

Signed-off-by: J. Bruce Fields <bfields at citi.umich.edu>
---

 fs/nfsd/export.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index f37df46..0747bb5 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -1104,6 +1104,10 @@ exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
 		 path, nd.dentry, clp->name,
 		 inode->i_sb->s_id, inode->i_ino);
 	exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
+	if (IS_ERR(exp)) {
+		err = PTR_ERR(exp);
+		goto out;
+	}
 	if (!exp) {
 		dprintk("nfsd: exp_rootfh export not found.\n");
 		goto out;