Merge tag 'for-5.13/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper fixes from Mike Snitzer:

 - Fix DM verity target's 'require_signatures' module_param permissions.

 - Revert DM snapshot fix from v5.13-rc3 and then properly fix crash
   when an origin has no snapshots. This allows only the proper fix to
   go to stable@ (since the original fix was successfully dropped).

* tag 'for-5.13/dm-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm snapshot: properly fix a crash when an origin has no snapshots
  dm snapshot: revert "fix a crash when an origin has no snapshots"
  dm verity: fix require_signatures module_param permissions

drivers/md/dm-snap.c

@@ -859,7 +859,8 @@ static uint32_t __minimum_chunk_size(struct origin *o)
 
 	if (o)
 		list_for_each_entry(snap, &o->snapshots, list)
-			chunk_size = min(chunk_size, snap->store->chunk_size);
+			chunk_size = min_not_zero(chunk_size,
+						  snap->store->chunk_size);
 
 	return (uint32_t) chunk_size;
 }

drivers/md/dm-verity-verify-sig.c

@@ -15,7 +15,7 @@
 #define DM_VERITY_VERIFY_ERR(s) DM_VERITY_ROOT_HASH_VERIFICATION " " s
 
 static bool require_signatures;
-module_param(require_signatures, bool, false);
+module_param(require_signatures, bool, 0444);
 MODULE_PARM_DESC(require_signatures,
 		"Verify the roothash of dm-verity hash tree");