md: check return code of read_sb_page

Function read_sb_page may return ERR_PTR(...). Check for it.

Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: NeilBrown <neilb@suse.de>

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index ed4900ade93a4d80b84784e76aafc406689020b2..e4fb58db5454d4bfc5cc5257bb74435907b3b3f2 100644 (file)
--- a/drivers/md/bitmap.c
+++ b/drivers/md/bitmap.c
@@ -1000,10 +1000,11 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start)
                                page = bitmap->sb_page;
                                offset = sizeof(bitmap_super_t);
                                if (!file)
-                                       read_sb_page(bitmap->mddev,
-                                                    bitmap->mddev->bitmap_info.offset,
-                                                    page,
-                                                    index, count);
+                                       page = read_sb_page(
+                                               bitmap->mddev,
+                                               bitmap->mddev->bitmap_info.offset,
+                                               page,
+                                               index, count);
                        } else if (file) {
                                page = read_page(file, index, bitmap, count);
                                offset = 0;