xnu-201.19.tar.gz

[apple/xnu.git] / bsd / vfs / vfs_vnops.c

diff --git a/bsd/vfs/vfs_vnops.c b/bsd/vfs/vfs_vnops.c
index a16dfb16759b4278374f3a61f0d9fd9b486acd57..b351d715b3f799342a829ccc691e397a51aa3b43 100644 (file)
--- a/bsd/vfs/vfs_vnops.c
+++ b/bsd/vfs/vfs_vnops.c
@@ -431,6 +431,7 @@ vn_ioctl(fp, com, data, p)
        register struct vnode *vp = ((struct vnode *)fp->f_data);
        struct vattr vattr;
        int error;
+       struct vnode *ttyvp;
 
        switch (vp->v_type) {
 
@@ -454,10 +455,11 @@ vn_ioctl(fp, com, data, p)
        case VBLK:
                error = VOP_IOCTL(vp, com, data, fp->f_flag, p->p_ucred, p);
                if (error == 0 && com == TIOCSCTTY) {
-                       if (p->p_session->s_ttyvp)
-                               vrele(p->p_session->s_ttyvp);
-                       p->p_session->s_ttyvp = vp;
                        VREF(vp);
+                       ttyvp = p->p_session->s_ttyvp;
+                       p->p_session->s_ttyvp = vp;
+                       if (ttyvp)
+                               vrele(ttyvp);
                }
                return (error);
        }