udf: Silence warning about accesses beyond end of device

Some of the computed positions of anchor block could be beyond the end of
device. Skip reading such blocks.

Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/udf/super.c b/fs/udf/super.c
index b9e719d..28ed3f5 100644 (file)
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -688,8 +688,12 @@ static int udf_check_anchor_block(struct super_block *sb, sector_t block,
        uint16_t ident;
        uint32_t location;
 
-       if (varconv)
+       if (varconv) {
+               if (udf_fixed_to_variable(block) >=
+                   sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits)
+                       return 0;
                bh = sb_bread(sb, udf_fixed_to_variable(block));
+       }
        else
                bh = sb_bread(sb, block);