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>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c
index ed4900ade93..e4fb58db545 100644
--- 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;