[PATCH] md - Zero out some kmalloced space in md driver

This should fix most (all??) of the recently reported problems with MD:

Recent changes to md malloced some data structures differently and
didn't zero out those data structures, where the old code had zeroed it
out.

This adds the relevant memsets.

drivers/md/linear.c

@@ -93,7 +93,7 @@ static int linear_run (mddev_t *mddev)
 			GFP_KERNEL);
 	if (!conf)
 		goto out;
-	memset(conf, 0, sizeof(*conf));
+	memset(conf, 0, sizeof(*conf) + mddev->raid_disks*sizeof(dev_info_t));
 	mddev->private = conf;
 
 	/*

drivers/md/multipath.c

@@ -397,6 +397,7 @@ static int multipath_run (mddev_t *mddev)
 			mdidx(mddev));
 		goto out_free_conf;
 	}
+	memset(conf->multipaths, 0, sizeof(struct multipath_info)*mddev->raid_disks);
 
 	conf->working_disks = 0;
 	ITERATE_RDEV(mddev,rdev,tmp) {

drivers/md/raid0.c

@@ -90,6 +90,9 @@ static int create_strip_zones (mddev_t *mddev)
 
 	memset(conf->strip_zone, 0,sizeof(struct strip_zone)*
 				   conf->nr_strip_zones);
+	memset(conf->devlist, 0,
+	       sizeof(mdk_rdev_t*) * conf->nr_strip_zones * mddev->raid_disks);
+
 	/* The first zone must contain all devices, so here we check that
 	 * there is a proper alignment of slots to devices and find them all
 	 */

drivers/md/raid1.c

@@ -47,7 +47,7 @@ static void * r1bio_pool_alloc(int gfp_flags, void *data)
 	r1_bio = kmalloc(sizeof(r1bio_t) + sizeof(struct bio*)*mddev->raid_disks,
 			 gfp_flags);
 	if (r1_bio)
-		memset(r1_bio, 0, sizeof(*r1_bio));
+		memset(r1_bio, 0, sizeof(*r1_bio) + sizeof(struct bio*)*mddev->raid_disks);
 
 	return r1_bio;
 }
@@ -1057,6 +1057,7 @@ static int run(mddev_t *mddev)
 		       mdidx(mddev));
 		goto out_free_conf;
 	}
+	memset(conf->mirrors, 0, sizeof(struct mirror_info)*mddev->raid_disks);
 
 	conf->r1bio_pool = mempool_create(NR_RAID1_BIOS, r1bio_pool_alloc,
 						r1bio_pool_free, mddev);

drivers/md/raid5.c

@@ -1458,7 +1458,7 @@ static int run (mddev_t *mddev)
 				  GFP_KERNEL);
 	if ((conf = mddev->private) == NULL)
 		goto abort;
-	memset (conf, 0, sizeof (*conf));
+	memset (conf, 0, sizeof (*conf) + mddev->raid_disks * sizeof(struct disk_info) );
 	conf->mddev = mddev;
 
 	if ((conf->stripe_hashtbl = (struct stripe_head **) __get_free_pages(GFP_ATOMIC, HASH_PAGES_ORDER)) == NULL)