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>

1 files changed, 5 insertions, 1 deletions

diff --git a/fs/udf/super.c b/fs/udf/super.c
index b9e719de0704..28ed3f5ebd70 100644
--- 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);