From: NeilBrown <neilb@suse.de>
Date: Tue, 23 Oct 2007 03:45:11 +0000 (-0700)
Subject: md: fix an unsigned compare to allow creation of bitmaps with v1.0 metadata
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=85bfb4da8cad483a4e550ec89060d05a4daf895b;p=openwrt%2Fstaging%2Fblogic.git

md: fix an unsigned compare to allow creation of bitmaps with v1.0 metadata

As page->index is unsigned, this all becomes an unsigned comparison,
which almost always returns an error.

Signed-off-by: Neil Brown <neilb@suse.de>
Cc: Stable <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index 927cb34c4805..7c426d07a555 100644
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -274,7 +274,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
 			if (bitmap->offset < 0) {
 				/* DATA  BITMAP METADATA  */
 				if (bitmap->offset
-				    + page->index * (PAGE_SIZE/512)
+				    + (long)(page->index * (PAGE_SIZE/512))
 				    + size/512 > 0)
 					/* bitmap runs in to metadata */
 					return -EINVAL;