diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 4726a4d014b6..811a035b600f 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -2215,9 +2215,10 @@ int8_t udf_current_aext(struct inode *inode, struct extent_position *epos,
 		if (!epos->offset)
 			epos->offset = sizeof(struct allocExtDesc);
 		ptr = epos->bh->b_data + epos->offset;
-		alen = sizeof(struct allocExtDesc) +
-			le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)->
-							lengthAllocDescs);
+		if (check_add_overflow(sizeof(struct allocExtDesc),
+					le32_to_cpu(((struct allocExtDesc *)epos->bh->b_data)
+						->lengthAllocDescs), &alen))
+			return -1;
 	}
 
 	switch (iinfo->i_alloc_type) {