From 41f48b56d05023b794d391b52d9b78d351c08317 Mon Sep 17 00:00:00 2001
From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Sat, 4 Jan 2014 09:27:49 +0000
Subject: Don't allow to create GELI providers with a sector size, which is no
 a power of 2.

Noticed by:	rwatson
MFC after:	3 days
---
 sbin/geom/class/eli/geom_eli.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sbin/geom/class/eli/geom_eli.c b/sbin/geom/class/eli/geom_eli.c
index 3eee6f249b54..7df4d905f4bc 100644
--- a/sbin/geom/class/eli/geom_eli.c
+++ b/sbin/geom/class/eli/geom_eli.c
@@ -789,7 +789,7 @@ eli_init(struct gctl_req *req)
 	if (val == 0)
 		md.md_sectorsize = secsize;
 	else {
-		if (val < 0 || (val % secsize) != 0) {
+		if (val < 0 || (val % secsize) != 0 || !powerof2(val)) {
 			gctl_error(req, "Invalid sector size.");
 			return;
 		}
-- 
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