diff --git a/fs/udf/super.c b/fs/udf/super.c
index a92daaba..9b8644a 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1403,6 +1403,8 @@
 
 					pos = udf_block_map(UDF_SB_VAT(sb), 0);
 					bh = sb_bread(sb, pos);
+					if (!bh)
+						return 1;
 					UDF_SB_TYPEVIRT(sb,i).s_start_offset =
 						le16_to_cpu(((struct virtualAllocationTable20 *)bh->b_data + udf_ext0_offset(UDF_SB_VAT(sb)))->lengthHeader) +
 							udf_ext0_offset(UDF_SB_VAT(sb));