btrfs: scrub: Set bbio to NULL before calling btrfs_map_block

We usually call btrfs_put_bbio() when btrfs_map_block() failed,
btrfs_put_bbio() works right whether bbio is a valid value, or NULL.

But there is a exception, in some case, btrfs_map_block() will return
fail without touching *bbio(keeping its original value), and if bbio
was not initialized yet, invalid memory accessing will happened.

Above case is in scrub_missing_raid56_pages(), and similar case in
scrub_raid56_parity().

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index fa35cdc..ab3b9d6 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -2181,7 +2181,7 @@ static void scrub_missing_raid56_pages(struct scrub_block *sblock)
        struct btrfs_fs_info *fs_info = sctx->dev_root->fs_info;
        u64 length = sblock->page_count * PAGE_SIZE;
        u64 logical = sblock->pagev[0]->logical;
-       struct btrfs_bio *bbio;
+       struct btrfs_bio *bbio = NULL;
        struct bio *bio;
        struct btrfs_raid_bio *rbio;
        int ret;
@@ -2982,6 +2982,7 @@ again:
                                                       extent_len);
 
                        mapped_length = extent_len;
+                       bbio = NULL;
                        ret = btrfs_map_block(fs_info, READ, extent_logical,
                                              &mapped_length, &bbio, 0);
                        if (!ret) {