On Mon, Sep 02, 2019 at 03:24:26PM +0000, Mateusz Guzik wrote:
> Author: mjg
> Date: Mon Sep 2 15:24:25 2019
> New Revision: 351702
> URL: https://svnweb.freebsd.org/changeset/base/351702
>
> Log:
> vfs: restore mp null check in vop_stdgetwritemount
>
> The initially read mount point can already be NULL.
>
> Reported by: markj
Just a correction: it was Peter that found the bug, not me.
> Fixes: r351656 ("vfs: stop refing freed mount points in
> vop_stdgetwritemount")
> Sponsored by: The FreeBSD Foundation
>
> Modified:
> head/sys/kern/vfs_default.c
>
> Modified: head/sys/kern/vfs_default.c
> ==============================================================================
> --- head/sys/kern/vfs_default.c Mon Sep 2 14:51:59 2019
> (r351701)
> +++ head/sys/kern/vfs_default.c Mon Sep 2 15:24:25 2019
> (r351702)
> @@ -601,6 +601,8 @@ vop_stdgetwritemount(ap)
> */
> vp = ap->a_vp;
> mp = vp->v_mount;
> + if (mp == NULL)
> + goto out;
> MNT_ILOCK(mp);
> if (mp != vp->v_mount) {
> MNT_IUNLOCK(mp);
>
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