null pointer bug (from ralph)

SCCS-vsn: sys/kern/vfs_vnops.c 8.14

diff --git a/usr/src/sys/kern/vfs_vnops.c b/usr/src/sys/kern/vfs_vnops.c
index 51d3994..280aaa6 100644 (file)
--- a/usr/src/sys/kern/vfs_vnops.c
+++ b/usr/src/sys/kern/vfs_vnops.c
@@ -9,7 +9,7 @@
  *
  * %sccs.include.redist.c%
  *
  *
  * %sccs.include.redist.c%
  *

- *     @(#)vfs_vnops.c 8.13 (Berkeley) %G%
+ *     @(#)vfs_vnops.c 8.14 (Berkeley) %G%

  */
 
 #include <sys/param.h>
  */
 
 #include <sys/param.h>


@@ -243,7 +243,8 @@ vn_write(fp, uio, cred)
                ioflag |= IO_APPEND;
        if (fp->f_flag & FNONBLOCK)
                ioflag |= IO_NDELAY;
                ioflag |= IO_APPEND;
        if (fp->f_flag & FNONBLOCK)
                ioflag |= IO_NDELAY;

-       if ((fp->f_flag & O_FSYNC) || (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS))
+       if ((fp->f_flag & O_FSYNC) ||
+           (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)))

                ioflag |= IO_SYNC;
        VOP_LEASE(vp, p, cred, LEASE_WRITE);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
                ioflag |= IO_SYNC;
        VOP_LEASE(vp, p, cred, LEASE_WRITE);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);