From 951f903c66a5c2c12f43b816d8c08e179d2b3d4f Mon Sep 17 00:00:00 2001
From: rodrigc <rodrigc@FreeBSD.org>
Date: Sat, 9 Dec 2006 16:34:37 +0000
Subject: In unionfs_readdir(), prevent a possible NULL dereference.

CID:		1667
Found by:	Coverity Prevent (tm)
---
 sys/fs/unionfs/union_vnops.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'sys/fs')

diff --git a/sys/fs/unionfs/union_vnops.c b/sys/fs/unionfs/union_vnops.c
index 9452da5..c06b76d 100644
--- a/sys/fs/unionfs/union_vnops.c
+++ b/sys/fs/unionfs/union_vnops.c
@@ -1462,6 +1462,10 @@ unionfs_readdir(struct vop_readdir_args *ap)
 		uio->uio_offset = 0;
 	}
 
+	if (lvp == NULLVP) {
+		error = EBADF;
+		goto unionfs_readdir_exit;
+	}
 	/* read lower */
 	error = VOP_READDIR(lvp, uio, ap->a_cred, ap->a_eofflag,
 			    ap->a_ncookies, ap->a_cookies);
-- 
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