On Wed, Jul 27, 2016 at 01:09:44AM +0000, Paul Goyette wrote:
> Module Name: src
> Committed By: pgoyette
> Date: Wed Jul 27 01:09:44 UTC 2016
>
> Modified Files:
> src/sys/dev: md.c
>
> Log Message:
> If we're going to check for a NULL pointer, do the check before we
> dereference it (to get the lock address).
>
>
> To generate a diff of this commit:
> cvs rdiff -u -r1.76 -r1.77 src/sys/dev/md.c
>
> Please note that diffs are not public domain; they are subject to the
> copyright notices on the relevant files.
>
> Modified files:
>
> Index: src/sys/dev/md.c
> diff -u src/sys/dev/md.c:1.76 src/sys/dev/md.c:1.77
> --- src/sys/dev/md.c:1.76 Mon Jan 4 16:24:52 2016
> +++ src/sys/dev/md.c Wed Jul 27 01:09:44 2016
> @@ -1,4 +1,4 @@
> -/* $NetBSD: md.c,v 1.76 2016/01/04 16:24:52 hannken Exp $ */
> +/* $NetBSD: md.c,v 1.77 2016/07/27 01:09:44 pgoyette Exp $ */
>
> /*
> * Copyright (c) 1995 Gordon W. Ross, Leo Weppelman.
> @@ -40,7 +40,7 @@
> */
>
> #include <sys/cdefs.h>
> -__KERNEL_RCSID(0, "$NetBSD: md.c,v 1.76 2016/01/04 16:24:52 hannken Exp $");
> +__KERNEL_RCSID(0, "$NetBSD: md.c,v 1.77 2016/07/27 01:09:44 pgoyette Exp $");
>
> #ifdef _KERNEL_OPT
> #include "opt_md.h"
> @@ -414,13 +414,13 @@ mdstrategy(struct buf *bp)
>
> sc = device_lookup_private(&md_cd, MD_UNIT(bp->b_dev));
>
> - mutex_enter(&sc->sc_lock);
> -
> if (sc == NULL || sc->sc_type == MD_UNCONFIGURED) {
> bp->b_error = ENXIO;
> goto done;
> }
>
> + mutex_enter(&sc->sc_lock);
> +
> switch (sc->sc_type) {
> #if MEMORY_DISK_SERVER
> case MD_UMEM_SERVER:
>
goto done; will exit mutex not entered now, I think.
