Btrfs: fix crash in scrub repair code when device is missing

Fix that when scrub tries to repair an I/O or checksum error and one of
the devices containing the mirror is missing, it crashes in bio_add_page
because the bdev is a NULL pointer for missing devices.

Reported-by: Marco L. Crociani <marco.crociani@gmail.com>
Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index b679bf68861e..7e487be0094e 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -998,6 +998,7 @@ static int scrub_setup_recheck_block(struct scrub_dev *sdev,
                         page = sblock->pagev + page_index;
                         page->logical = logical;
                         page->physical = bbio->stripes[mirror_index].physical;
+                        /* for missing devices, bdev is NULL */
                         page->bdev = bbio->stripes[mirror_index].dev->bdev;
                         page->mirror_num = mirror_index + 1;
                         page->page = alloc_page(GFP_NOFS);
@@ -1042,6 +1043,12 @@ static int scrub_recheck_block(struct btrfs_fs_info *fs_info,
                 struct scrub_page *page = sblock->pagev + page_num;
                 DECLARE_COMPLETION_ONSTACK(complete);
 
+                if (page->bdev == NULL) {
+                        page->io_error = 1;
+                        sblock->no_io_error_seen = 0;
+                        continue;
+                }
+
                 BUG_ON(!page->page);
                 bio = bio_alloc(GFP_NOFS, 1);
                 if (!bio)